Thru Hull Boat Fittings

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Sale Prices & Spring. Bring it on!
Attwood Thru-Hull With Strainer
    Features: Prevents debris from entering and clogging the aerator pump. Strainer attaches to threads that extend beyond external retaining nut. Tough …
    List price: $8.29
    Starting at $6.23
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    Stainless Steel Nylon Thru-Hull Connectors
      316 stainless steel/nylon barbed thru-hulls. Available in straight or 90°.
      List price: $8.59
      Starting at $6.57
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      Thru-Hull Connector (Attwood Marine)
        Molded of rugged plastic. Will not rust, corrode, discolor or contribute to electrolysis. Design eliminates hull streaking and allows …
        List price: $4.99
        Starting at $3.90
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        90 degree Thru Hull Connectors
          Features: Molded of rugged high-impact plastic. Will not corrode, discolor or contribute to electrolysis. Features finished head, single pass around …
          List price: $4.19
          Starting at:
          $3.23
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          Thru Hull Straight Fitting
            High impact. White, corrosion proof nylon thru-hull fitting. For use above water-line only.
            List price: $2.89
            Starting at:
            $2.34
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            Seachoice 90° Thru-Hull Connectors
              90 Degree - One Nut Application Designed for use with one back nut, unlike old style 90 degree thru-hull with both front and back nut. Made of hi- …
              List price: $9.45
              Starting at:
              $7.79
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              Brite Plate Chrome Plated Fittings
                The look of stainless but with the price of plastic. Strong plating process strengthens parts. Five step metal bonding process. Won't flake, chip or …
                List price: $6.49
                Starting at:
                $5.46
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                T-H Marine Extra Longthru-Hull Fitting
                  50 plugs per pack Hose I.D.: 1 1/2" Length: 6" Maximum hull thickness: 3 1/2" Flange diameter: 2 7/8" Installation hole diameter: 1 7/8" - 2"
                  List price: $10.79
                  Your price:
                  $8.39
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                  Seachoice Thru-Hull Connections
                    Features: "Chrome Plated Plastic" Use in place of Stainless Steel thru-hulls.
                    List price: $6.15
                    Starting at:
                    $5.34
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                    Seachoice Straight Thru-Hull Connectors
                      Features: Molded plastic with broad flange. Per ABYC "Safety Standards for Small Craft Not recommended for use below the waterline. Technical Info …
                      List price: $3.85
                      Starting at:
                      $3.32
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                      THRU HULL W/SS COVER-1 1/4 90 - Seachoice
                        Molded from polypropylene with glass fiber for strength. Not recommended for use below the waterline.
                        List price: $16.45
                        Your price:
                        $12.95
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                        THRU HULL W/SS COVER-5/8 STRT - Seachoice
                          Molded from polypropylene with glass fiber for strength. Not recommended for use below the waterline. 5/8" Hose 1-7/8" Flange 1-3/8" Max Hull …
                          List price: $8.95
                          Your price:
                          $7.05
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                          THRU HULL W/SS COVER-1 1/8 ST - Seachoice
                            Molded from polypropylene with glass fiber for strength. Not recommended for use below the waterline.
                            List price: $10.75
                            Your price:
                            $8.47
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                            THRU HULL W/SS COVER-3/4 90DG - Seachoice
                              Molded from polypropylene with glass fiber for strength. Not recommended for use below the waterline.
                              List price: $9.95
                              Your price:
                              $7.84
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                              THRU HULL W/SS COVER-1 STRAT - Seachoice
                                Molded from polypropylene with glass fiber for strength. Not recommended for use below the waterline.
                                List price: $10.75
                                Your price:
                                $8.47
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                                THRU HULL W/SS COVER-3/4 STRT - Seachoice
                                  Molded from polypropylene with glass fiber for strength. Not recommended for use below the waterline.
                                  List price: $9.25
                                  Your price:
                                  $7.28
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                                  THRU HULL W/SS COVER-1 1/2 90 - Seachoice
                                    Molded from polypropylene with glass fiber for strength. Not recommended for use below the waterline.
                                    List price: $21.45
                                    Your price:
                                    $16.89
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                                    THRU HULL W/SS COVER-1 1/8 90 - Seachoice
                                      Molded from polypropylene with glass fiber for strength. Not recommended for use below the waterline.
                                      List price: $14.25
                                      Your price:
                                      $11.22
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                                      THRU HULL W/SS COVER-1 90 DEG - Seachoice
                                        Molded from polypropylene with glass fiber for strength. Not recommended for use below the waterline.
                                        List price: $12.25
                                        Your price:
                                        $9.65
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                                        THRU HULL W/SS COVER-1 1/4 ST - Seachoice
                                          Molded from polypropylene with glass fiber for strength. Not recommended for use below the waterline.
                                          List price: $13.45
                                          Your price:
                                          $10.48
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                                          THRU-HULL CONN-WHT 11/2 X90DEG - Seachoice
                                            Designed for use with one back nut unlike old style 90" thru-hull with both front and back nut. Made of hi-impact white plastic. Designed for easier …
                                            List price: $10.45
                                            Your price:
                                            $8.18
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                                            THRU HULL W/SS COVER-1 1/2 ST - Seachoice
                                              Molded from polypropylene with glass fiber for strength. Not recommended for use below the waterline.
                                              List price: $13.75
                                              Your price:
                                              $10.76
                                              In stock
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                                              THRU HULL W/SS COVER-5/8 90DG - Seachoice
                                                Molded from polypropylene with glass fiber for strength. Not recommended for use below the waterline.
                                                List price: $9.95
                                                Your price:
                                                $7.84
                                                In stock
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                                                THRU HULL W/SS COVER-2 STRAT - Seachoice
                                                  Molded from polypropylene with glass fiber for strength. Not recommended for use below the waterline.
                                                  List price: $19.25
                                                  Your price:
                                                  $15.16
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                                                  THRU HULL 3/4" BLACK - Marpac
                                                    * Molded plastic * Note: These thru-hulls for hose are not recommended for use below the waterline
                                                    List price: $4.20
                                                    Your price:
                                                    $3.57
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                                                    THRU HULL WHITE 3/4" - Marpac
                                                      List price: $4.09
                                                      Starting at:
                                                      $3.48
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                                                      NYLN/SS THRU HULL 1-1/8" - Marpac
                                                        * All nylon thru-hull with stainless steel outside cover
                                                        List price: $9.98
                                                        Your price:
                                                        $8.48
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                                                        SS THRU HULL HOSE 1-1/8" - Marpac
                                                          * Stainless steel * Includes stainless steel nut. The thread length is 2-1/4 inches.
                                                          List price: $27.98
                                                          Your price:
                                                          $23.78
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                                                          Brite Plate Chrome Plated Thru Hull Fitting, 90°, 3/4", 5/8" Hull - T-H Marine Supply
                                                            Brite Plate™ Chrome Plate-3/4" Thru Hull-90 Degree The look of stainless but with the price of plastic. Strong plating process strengthens …
                                                            List price: $6.89
                                                            Your price:
                                                            $5.86
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                                                            3/4" White Thru Hull Connector, 1-1/4"Hull - T-H Marine Supply
                                                              Hose I.D.: 3/4" Length: 3 1/4" Maximum hull thickness: 1 1/4" Flange diameter: 1 3/4" Installation hole diameter: 1 1/16" All T-H Marine Thru-Hull …
                                                              List price: $3.79
                                                              Your price:
                                                              $2.73
                                                              In stock
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                                                              90&Deg; Thru-Hull Fittings (Rule)
                                                                High impact molded plastic. Will not rust, corrode or discolor.
                                                                List price: $10.69
                                                                Starting at:
                                                                $6.99
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                                                                Flange Nuts (Conbraco / Apollo)
                                                                  Cast bronze for thru hull connectors. Made in U.S.A. NOT TO BE USED IN POTABLE WATER SYSTEMS.
                                                                  List price: $7.19
                                                                  Starting at:
                                                                  $5.33
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                                                                  56 Items | 1 of 2 pages
                                                                   1 2
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                                                                  Boating Know How
                                                                  Thru Hull Threads (Video)
                                                                  A video demonstration on threads thru the hull presented by Forespar. ... read more



                                                                  Video Transcript

                                                                  And now for the exciting topic of threads on thru hulls.

                                                                  On a marine thru hull- first of all a thru hull is just that. It is the fitting that goes through the hull and is secured or fastened on the inside with a nut or with a flanged valve called a seacock which replaces that nut.

                                                                  It’s also important to note here that marine thru hulls all have parallel threads. No matter if they are US thread, BSB, or buttress- they are all parallel threaded. This is because no one ever knows the hull thickness that they are going to be installed on, so a taper would cause problems as the thru hull threads need to be cut to length for a given seacock installation or a valve installation.

                                                                  This also means that the true marine seacocks or valves are also female parallel threaded to accept the thru hull. Non marine fittings and valves usually have NPT or nationally piped taper thread. This type is generally used in irrigation or house plumbing and should never be used below waterline. This is true of tail pipes and elbows on top of the valve as well. These connections must be sound and leak free. There is also more important information on threads on our website, forespar.com

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                                                                  Why Marelon Plumbing Parts? (Video)
                                                                  A video presentation on why Marelon plumbing parts are the best for your boat repairs ... read more



                                                                  Video Transcript

                                                                  Hi. I’m Wes Gary. I’ve built boats and I’ve been around sail and power boating for most my life. I’ve had my own plastics business for over 25 years and I’ve built a 55 foot slew. I know polymer composites very well.

                                                                  I’m here today to talk about Forespars line of Marelon marine plumbing fittings. I know that Marelon is not just a plastic but an engineered carbon fiber and glass re-enforced composite polymer, ideally formulated for marine use. You go to your local boating supply store and you will notice that there are several plastic plumbing choices available. Marelon, however, is the only plastic to meet the rigorous marine UL test. Its also ISO certified and Marelon also meets the ABYC standards for above and below the waterline. These are the same tests that bronze or stainless steel parts have to pass too. I mention this because some of you may have seen Marelon fittings in stores and thought ot yourselves… ehhh… it’s a plastic and bronze has been the material of choice for boats in the past. Well think again.

                                                                  What’s your boat made of? What about the hoses that are going to the valves? Well, if you accept those materials below the waterline, why not a valve that’s made from truly 21st century carbon fiber reinforced polymer composite.

                                                                  There are other reasons as well. Marelon wil never corrode. Because it’s not made of anything metallic, it’s never subject to the cancer ravages of electrolysis. You don’t have to bond Marelon so you don’t have the additional copper bonding wires and you don’t’ have the additional potential corrosion of those as well, so all that goes away.

                                                                  Marelon is also very lightweight. A typical bronze 1 1/2” seacock weighs about 10 pounds. A comparable Marelon 1 1/2” seacock weighs less than 2 pounds. Think about how more efficient you are going to be and how much more beer you can carry.

                                                                  As you walk down the plumbing isle of your favorite marine hardware store, and you see the plastic stuff on the shelf, remember that all plastics are not created equal. Marelon is about as close as you can get to the material that your boat is made of in a precision melded, marine approved, polymer composite. It’s time to step out of the Bronze Age.

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