FREE Shipping on Orders $149.99 and up (Continental U.S.)
-20AN Water-neck Adapters, No Welding-No Clamps required

-20AN Water-neck Adapters, No Welding-No Clamps required

Regular price $59.95 Sale


 No Welding - No Clamps required. Easily go from one water-neck size to another without the need of reducers, splices or clamps while maintaining the same hose size. Perfect for LS swaps when the pump is one size and the radiator is another. Our adapters can be installed on any water-neck (Radiator, Water Pump, Thermostat Housing, etc. ) We guarantee our adapters to be leak proof and are warranted against mechanical failure. Our Adapters are both removable and reusable. Patented

To aid in determining the correct parts for your application and help ensure ordering the correct parts, use the -20an Templates found under Mock-up / Assembly instructions at the top of this page.


 Step 6: Placing your Order

IMPORTANT: Accurately measure the water necks OD ( Not the Bead ) for each water neck to be adapted. Use calipers or micrometer for the measurement. Water-neck OD Tolerance  -010"  +.015"

Order from the menu above. Select size and color. Choose Color. Add quantity of each in cart.

 For ease in Adapter and Hose assembly we recommend our -20AN Wrenches .

Click Here to:

Continue Ordering Components Thermostat Housings 

Customer Reviews

Based on 7 reviews
Mike Chalfant

went together perfectly

John Anderson
Doesn't get any better than this!

I was looking for a nice radiator hose setup for my Chevelle. I was hesitant at first and purchased a few other designs. I regret ever thinking anything else on the market even came close. This is by far the best hose kit ever made! Just follow the instructions and you will love the results.


I love the set upper blind ties rite with what I am doing the 20 gage fitting and adjustable thermal housing and hoses makes everything flow.wealth every penny

Tom Harris
Amazing Experience - '69 Chevelle

Super happy with the results, from the ordering to final installation. Ordered the wrong color first, and the return was simple and headache free. Innovative design and sexy looks. Totally recommend for anyone's vehicle.


This is the 5th adapter I have purchased. All have been excellently made and perfectly fit