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TracTuff P13 Filler Neck


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 P13/ PCB (H22A/ F20B) cylinder head is an entry-level product that gets it done. 

The filler neck starts with a beautifully machined 6061-T6 flange cylinder head flange that is designed and machined with an angled exit port for a seamless transition to 1.25" tubing and an o-ring grove on the backside for a positive seal against the cylinder head. The outlet can be configured to your needs, whether that be straight tube (shown) that essentially follows the OEM angle or a curved tube that produces a 90° outlet that points to the passenger fender. Choose between standard hose (1.25" OD) or -16 male flare.

NOTE: Made to Order - Contact for ETA - If you are interested in a specific design that varies from this, please email us at 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.

 The filler neck includes two stainless M6 socket head bolts and an o-ring. The filler is welded so that it sits level when bolted to an engine with a 10.5° lean back (traditional) or 4.2° lean forward (QSD H2B).