TracTuff RBB/ RBC Filler Neck - V1

Whether you have added a radiator that does not have a fill point or you are just in need of a higher fill point to aid in burping the sometimes troublesome cooling system, the filler neck for the K24A, K24A2, K24A4, K24A8, K20Z3, and K20Z4 or anyone using the RAA/ RBB/ RBC/ RSP cylinder head is an entry-level product that gets it done. 

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 can be configured for standard hose (1.25" OD) or -16 male flare. This version has a fabricated exit that points the same as the OEM outlet angle. The outlet 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. The filler tube is welded so that it sits level when bolted to an engine leaned back 15° (OEM option) or leaned forward 8° (Gangster Lean engine mount option). 

Space between the filler tube and the flange make the upper forward most mounting bolt a challenge to get to without the right tools. If you don't already own one, you may want to add a 6mm Stubby L-Key.

NOTE: Made to Order - Contact for ETA - 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. If you are using AN lines, I 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.

Photo Courtesy of Manny Cruz