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TracTuff RBB/ RBC Rear Wheel Drive K Swap Filler Neck

$322.95

The filler neck is a substantial upgrade from the standard RWD upper water neck with a bleeder and the new offset filler tube has improved firewall clearance for a number of applications.

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 or the huge air pocket that is created as a result of the outlet tube diving under the intake manifold. 

This product significantly reduces the headache of adding fluid and bleeding the system at its highest point. If space or budget allow, look into a fill pot or swirl pot for increased cooling system efficiency. 

This filler neck starts with a beautifully machined 6061-T6 flange that incorporates a -16 ORB outlet port and a 1/2" NPT heater port. The welded outlet itself can be configured for standard hose (1.25" OD) or -16 male flare.

The hardware kit includes four M8 stainless steel socket head bolts, a 90° heater hose fitting, a 1/2" NPT plug and either a Genuine Honda gasket or a pair of o-rings.


NOTE: Made to Order - Contact for ETAIf you have selected "Other" for intake manifold, please send an email with your order number and manifold type. 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). 



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