TracTuff PRB/ PRC Rear Wheel Drive K Swap Filler Neck

Description

The filler neck is a substantial upgrade over the standard RWD upper water neck, even the version with the bleeder

Normally, the water neck is pretty much right in front of the radiator, and the two points are pretty much equal in height… and even then, the K is notorious for being a real bitch to bleed! Rotate the motor 90°, and you no longer have access to the highest point in the cooling system. It’s very common for a large air pocket to develop here when the upper hose dives under the intake manifold.

This product significantly reduces the headache of adding fluid to the system, especially when the radiator’s fill point is not at or above the upper water neck. Initial bleeding of the system becomes a breeze, but air can still accumulate here, so if space or budget allow, you may want to consider a fill pot or swirl pot to improve cooling system efficiency.

This filler neck starts with a billet flange machined from US-milled 6061 material. The flange incorporates an o-ring groove to accept an OEM gasket and incorporates a -8 ORB water bypass port. You can choose to add a sensor port directly to the top of the flange (near the logo).

The hardware kit includes two M6 socket head bolts, an 11/16″ heater hose fitting, and a Genuine Honda gasket.

NOTE: If you have selected “Other” for the intake manifold, please include the info in the “Notes” field during checkout. If you are interested in a specific design that varies from this, please email us at sales@tractuff.com.

The cap bung has a 1/16″ NPT port for connection to an overflow and uses early model Honda radiator caps, such as an 88′-91′ Civic/ CRX or 90′-93′ Integra. The sensor port selection is optional; if you don’t have/ need a sensor, don’t select it. I only offer two threads… 1/8″ NPT or 1/8″ BSPT (Honda Single Prong Sensor).

The filler tube is welded so that it sits level when bolted to an engine leaned back 15° (OEM position).