Seadog Line
Watertight Inspection or Access Port Deck Plate 4" White Screw-In SeaDog Line
Price: $12.35
Save: $2.85
(18% Off $15.20)
Part # 337140-1
2nd Day Air for $2.99 More Eligible
This item is found in the following Product Families
  • 4" Screw Out Deck Plate, White
  • Sea Dog line deck plates are molded to the highest standards using top quality UV stablizers and anit-oxidents.
  • Single start non-jamming extra strong buttress thread design eliminates jamming problems of multi start or fine thread deck plates.
  • Screw out plates with water tight 'O' ring are recommended for use where internal pressure ( oil canning ) may occur.
  • See chart in picture: A: 4-7/16", B: 5-3/4", C: 4-1/2", D: 5-1/8" Color White, Fastner size #8
Full StarFull StarFull StarFull StarFull Star
4" Access Deck Plate
by Barry from Trinity, North Carolina on April 13, 2014
Quality Product
Was this review helpful?
Full StarFull StarFull StarEmpty StarEmpty Star
Missing screws
by Shawn from Hardy, Virginia on July 25, 2013
Had to go buy SS screws - none in box. Aggravation. Port itself was fine. Template for cutout was helpful.
Was this review helpful?
Full StarFull StarFull StarFull StarFull Star
Deck Plates
by John from Cincinnati, Ohio on July 10, 2012
I replaced older deteriorating plates and these were a perfect match. Excellent quality at a very good price.
Was this review helpful?
Full StarFull StarFull StarFull StarEmpty Star
Good plate
by Cloyd from Carmel, New York on June 12, 2012
Specs on size correct. Seems to screw/unscrew smoothly, and ridges on underside keep adhesive spread well. Be careful not to screw too tightly to hull -- looks like two of the screws I put in stressed the plastic which looks like it may crack at these stress points over time.
Was this review helpful?
Full StarFull StarFull StarFull StarFull Star
Keeps the water on the Outside of the boat
by Michael from Wetumpka, Alabama on April 09, 2012
Replaced those old cracked ports perfectly
Was this review helpful?
Full StarFull StarFull StarFull StarFull Star
great product - fair price
by Jeffrey from Indialantic, Florida on March 19, 2012
Couldn't find a screw-in 4 inch access plate locally - this one fit the bill perfectly. It shipped quickly and worked perfect.
Was this review helpful?
What is the dimensions of the 4" model?
Hole size is 4-1/2 inch, outer diameter is 5-3/4 inch, screw to screw diameter is 5-1/8 inch, and plate is 4-7/16 inch.

Need to replace one tht is 5.25" O. D. and 4" I. D. What does this one measure?
This O.D. is 5-3/4". I.D. is 4-7/16".

Can you match? Mine is A=4.25", B=5.25", C=4", D=4.75"?
We do not carry any in those exact dimensions unfortunately.

Ask a question
Question & Answer Guidelines
This product ships in 1 business day.
Add to Cart and enter your Postal Code to determine the shipping charges.
Most products and orders leave our warehouse in 1 business day. However, select items may take more processing time. Alaska and Hawaii orders please add 1 additional warehouse processing day.
Standard Shipping Policies