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HP Years Johnson Thermostat Mallory Thermostat Sierra Thermostat Kit Mallory Thermostat Kit
5 1965-1968, 1986 18-3553 9-43019 18-3672 (5) 9-43101
5.5 1959-1964 18-3553 9-43019 18-3672 (5) 9-43101
6 1965-1979, 1986 18-3553 9-43019 18-3672 (5) 9-43101
7.5 1980-1986 18-3553 9-43019 18-3672 (5) 9-43101
8 1986 18-3553 9-43019 18-3672 (5) 9-43101
9.5 1964-1973 18-3553 9-43019 18-3672 (5) 9-43101
9.9 1974-1986 18-3553 9-43019 18-3672 (5) 9-43101
10 1959-1963 18-3553 9-43019 18-3672 (5) 9-43101
15 1974-1986 18-3553 9-43019 18-3672 (5) 9-43101
18 1959-1973 18-3553 9-43019 18-3672 (5) 9-43101
20 1981-1994 18-3553 9-43019 18-3672 (5) 9-43101
25(1) 1969-1994 18-3553 9-43019 18-3672 (5) 9-43101
28 1989-1994 18-3553 9-43019 18-3672 (5) 9-43101
30 1986-1994 18-3553 9-43019 18-3672 (5) 9-43101
35 1959, 1976-1994 18-3553 9-43019 18-3672 (5) 9-43101
40 1960-1969 18-3553 9-43019 18-3672 (5) 9-43101
45 1989-1992 (2) 18-3553 9-43019 18-3672 (5) 9-43101
50 1971-1975, 1979, 1981-1986 18-3553 9-43019 18-3672 (5) 9-43101
55 1976-1992 (3) 18-3553 9-43019 18-3672 (5) 9-43101
60 1969-1970 18-3557 9-43024 18-3669 (5)  
60 1980-1986 18-3553 9-43019 18-3672 (5) 9-43101
60, 60TTL 1993 18-3561 9-43023    
65 1971-1973 18-3557 9-43024 18-3669  
65 1993 18-3561 9-43023    
65C 1984-1986 18-3557 9-43024 18-3669  
65 Jet 1994-1995 18-3553 9-43019 18-3673  
70 1974-1986 18-3557 9-43024 18-3669  
70,70TTL 1993 18-3561 9-43023    
75 1978-1988 18-3557 9-43024 18-3669  
80 Jet 1994-1995 18-3553 9-43019 18-3673  
85 1978-1980 18-3553 9-43019 18-3673  
85 1993-1995 18-3553 9-43019 18-3673  
88 1987-1995 18-3553 9-43019 18-3673  
90(4) 1983-1995 18-3553 9-43019 18-3673  
90 2003-2006 18-3548
[out of stock]
     
90 2004-2006 18-3544
[out of stock]
     
90 Jet 1994 18-3553 9-43019 18-3673  
100 1979-1980 18-3553 9-43019 18-3673  
100 1990-1995 18-3553 9-43019 18-3673  
100 Comm 1984-1995 18-3553 9-43019 18-3673  
105 2003 18-3544
[out of stock]
     
110 1985-1989 18-3553 9-43019 18-3673  
112 1994-1995 18-3553 9-43019 18-3673  
115(4) 1978-1995 18-3553 9-43019 18-3673  
115 2002-2006 18-3544
[out of stock]
     
115 2003-2006 18-3548
[out of stock]
     
140 1978-1985 18-3553 9-43019 18-3673  
140 2003-2006 18-3548
[out of stock]
     
150 1978-1991 18-3553 9-43019 18-3672 (5) 9-43101
150 1993-1994, 2002-2006 18-3544
[out of stock]
     
155 1984-1991 18-3553 9-43019 18-3672 (5) 9-43101
175 1977-1991 18-3553 9-43019 18-3672 (5) 9-43101
175 1994, 2002-2006 18-3544
[out of stock]
     
185 1984-1985 18-3553 9-43019 18-3672 (5) 9-43101
200 1977-1983 18-3553 9-43019 18-3672 (5) 9-43101
200 2000-2001 18-3546
[out of stock]
     
200 2004-2005 18-3548
[out of stock]
     
225 2000-2001 18-3546
[out of stock]
     
225 2004-2005 18-3548
[out of stock]
     
235 1978-1985 18-3553 9-43019 18-3672 (5) 9-43101
250 2000-2001 18-3546
[out of stock]
     
HP Years Johnson Thermostat Mallory Thermostat Sierra Thermostat Kit Mallory Thermostat Kit
Notes:
(1) : All 1989-91 models except DR & DT
(2) : Commercial
(3) : Commercial also
(4) : Except 60 degree models
(5) : For complete Thermostat Kit including gaskets & spring use 18-3674

$21.99 - Sierra 18-3500 Thermostat
Compare at $29.99
Part # 18-3500
$8.99 - Sierra 18-3553 Thermostat
Compare at $11.69
Part # 18-3553
$12.99 - Sierra 18-3557 Thermostat
Compare at $14.99
Part # 18-3557
$9.99 - Sierra 18-3561 Thermostat
Compare at $11.49
Part # 18-3561
$12.99 - Mallory Thermostat (143) 9-43024
Compare at $19.45
Part # 9-43024
$9.99 - Mallory Thermostat 9-43023
Compare at $12.45
Part # 9-43023
$8.99 - Mallory Thermostat (143) 9-43019
Compare at $10.40
Part # 9-43019
$16.99 - Mallory Thermostat 9-43030
Compare at $20.51
Part # 9-43030
$15.99 - Mallory Thermostat (133) 9-43031
Compare at $19.79
Part # 9-43031
Sierra
Johnson Thermostats 18-3500 Thermostat
Sierra 18-3500 Thermostat
140 Degree

For:
  • 3 Cyl. (1992 & Up)
  • 90 Degree (1990-1992)
Replaces OEM part #
  • OMC 434137


Johnson Thermostats
Sierra 18-3553 Thermostat
143 Degree

Replaces OEM part #
  • CHRYSLER FORCE F664068
  • OMC 378065
  • OMC 393659
  • OMC 434841
  • OMC 508626
  • MERCURY MARINE 75692


Johnson Thermostats 18-3557 Thermostat
Sierra 18-3557 Thermostat
1" - 143 Degree

Replaces OEM part #
  • CHRYSLER FORCE F335068
  • OMC 382385
  • OMC 396987
  • MERCURY MARINE 47594


Johnson Thermostats 18-3561 Thermostat
Sierra 18-3561 Thermostat
143 Degree

Replaces OEM part #
  • OMC 436195


mallory thermostat (143) 9-43024
Mallory Thermostat (143) 9-43024
Replaces Original Equipment Manufacturer(OEM):CHRYSLER FORCE
Replaces Original Equipment Manufacturer # (OEM #):F335068


johnson/evinrude cooling system-mallory thermostat 9-43023
Mallory Thermostat 9-43023
Replaces Original Equipment Manufacturer(OEM):Johnson/Evinrude
Replaces Original Equipment Manufacturer # (OEM #):436195


evinrude thermostats-mallory thermostat (143) 9-43019
Mallory Thermostat (143) 9-43019
Replaces Original Equipment Manufacturer(OEM):Johnson/Evinrude / Mercury/Force
Replaces Original Equipment Manufacturer # (OEM #):434841 / 75692


evinrude thermostats-mallory thermostat 9-43030
Mallory Thermostat 9-43030
Replaces Original Equipment Manufacturer(OEM):Johnson/Evinrude
Replaces Original Equipment Manufacturer # (OEM #):5001036


evinrude thermostats-mallory thermostat (133) 9-43031
Mallory Thermostat (133) 9-43031
Replaces Original Equipment Manufacturer(OEM):Johnson/Evinrude
Replaces Original Equipment Manufacturer # (OEM #):437090


This product typically leaves our warehouse in 1 to 3 business days.

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General Policy

We work hard to provide you with the best value in product prices and shipping charges, and to get your order to you in a timely, safe, and convenient manner. Internet sales involve the cost of getting the product to you, and shipping carriers base that cost on the size and weight of the package, plus the distance the package travels from our warehouse to your door. We keep our product prices low, negotiate low shipping charges from our carriers and pass those savings on to you, and we don't charge sales tax (except for residents of Utah), so your order from iboats.com is the best value for all your boating needs.

Our standard shipping method is UPS ground, which typically takes 2-5 additional transit days after the order has left our warehouse, depending on your delivery address. We also offer other shipping options, including expedited delivery, and the actual delivery date will depend on the shipping options you choose.

Shipping to Canada

Most products sold by iboats.com can be purchased and shipped to Canada. Some restrictions apply to certain items, such as hazardous materials, over-weight products, and the method of shipping. Available product lines, shipping rates and fees may vary depending on the delivery address for your order.

Currently, iboats.com offers ground shipping to all Canada provinces. Our Canadian brokerage service accelerates your orders through the Customs clearance process and facilitates the delivery of your order through Canada Post or the best method based on your shipping address. We do not currently offer expedited shipping methods to Canada.

At iboats.com we want to simplify your transaction and give you a pleasing purchasing experience so you'll come shop with us again and again. We therefore calculate all the duties, taxes, and other fees specific to Canadian orders and show you the total landed cost of getting the order to your door. There are no hidden fees and will be no surprise COD charges when the package is delivered to you.

Order History & Tracking

We provide several methods to track your order and keep you informed of your order status and expected delivery date. After completing an iboats.com purchase transaction, an account will automatically be created for your provided email address. You'll receive an email from iboats.com Customer Service informing you of your new User Account and the many benefits it provides. If you don't wish to have an iboats.com Account with password, do nothing and your account won't be registered; however, you can respond to the instructions in the email and easily register your account and setup a password. This will allow you to sign in to your account by choosing the Order Status link from any iboats.com page, where you can browse your order history and track the status of all your orders - tracking numbers are displayed that link to the delivery carrier's tracking webpage.

If you have provided your email address during checkout, we will also email you your invoice, which includes a link for tracking your order and viewing the current status of your order. Refer to your invoice email and tracking link any time you wish to track the status of your order

Friendly Return Policy

  • If the merchandise you received was defective, damaged, or an error was made by iboats.com, simply return the merchandise within 30 days of the original shipping date for a full refund.
  • See the specific requirements and instructions below for United States or Canadian orders.

Returns for U.S. Customers

We want to make it as easy as possible for you to return an unwanted item; afterall, we want you to return again and again as a satisfied iboats.com customer, and to also continue recommending us to your friends.

As mentioned above, if the merchandise you received was defective, damaged, or an error was made by iboats.com, simply return the merchandise within 30 days of the original shipping date for a full refund. Merchandise must still be in brand-new, unused condition with all original packaging in good condition; plus parts, accessories, manuals, and/or warranty cards included. Please note that all return merchandise must be accompanied by an RA (Return Authorization) number issued by iboats.com. To receive your RA number simply call our Returns Department toll-free at 1-800-914-1123 or email us at returns@iboats.com.

If for some reason you need to return merchandise for reasons other than those mentioned above, follow the same procedures, obtaining an RA number from iboats.com, within 30 days of the original shipping date. Please note that there may be restocking fees, shipping costs, or product change order costs associated with some returns. Feel free to check with the iboats.com Returns Department for specific terms, conditions, and eligibility.

Returns for Canadian Customers

We request that all Canadian customers verify and re-check that the products you are ordering are what you want and are correct for your application or intended use. iboats.com does not accept any return merchandise on Canadian orders, unless the merchandise you received was defective, damaged, or an error was made by iboats.com. In such cases, return the merchandise within 30 days of the original shipping date for a full refund, following the procedures below.

Canadian orders involve many additional costs dealing with Customs, Provincial taxes, brokerage fees, and more, making product returns complicated and very expensive and costly for both the customer and iboats.com. Again, help us serve you best by verifying that the products you are ordering are what you want so we don't have any costly returns or have to deny a return.

If a return meets the criteria mentioned above, merchandise must still be in brand-new, unused condition with all original packaging in good condition; all parts, accessories, manuals, and/or warranty cards included. Please note that all return merchandise must be accompanied by an RA (Return Authorization) number issued by iboats.com. To receive your RA number call our Customer Service Department toll-free at 1-800-914-1123, Tuesday-Friday, 10am-7pm EST, or email us at returns@iboats.com. We will provide further details on where and how to mail the merchandise. Please note that returns sent from rural Canadian addresses may take up to five weeks to process after the package is mailed.

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