TracTuff P75 Billet Water Neck w/ Swirl Tank

TracTuff P75 Billet Water Neck w/ Swirl Tank


B18A, B18B, B20A and B20Z engine owners... this is the pennical of our water neck offerings! The proven swirl tank.

Starting with a beautifully machined flange that incorporates a 3D tapered entry port for a seamless transition to the tubing that is routed to the tank. The tank placement clears the distributor and the outlet still exits similarly to the original location; upper hose may still work. 

1. Billet water neck with bead rolled 1-1/4" aluminum tube so you can attach a rubber/ silicone hose - Not Shown

2. Billet water neck with 1-3/8" aluminum tube for a seamless transition to our -16 male bung - Shown

All billet parts are CNC machined from US milled 6061 aluminum. The radiator cap bung uses the larger domestic style cap for the largest opening and huge selection of cap offerings. 

NOTE: Made to Order - Contact for ETA - If you are interested in a specific design that varies from this, please email us at If using AN lines we also recommend designing the upper radiator hose so that there is droop/ give so the engines movement and does not push/ pull on the radiator and fatigue any parts. The tank is welded so that it sits level when bolted to an engine with a 6° lean forward (exhaust side).