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Vehicle / Engine Applications: 02-06 RSX Type-S + Type-R K20A/A2/Z1 (PRB head), 02-06 RSX Base K20A3 (PNC head), 02-05 Civic Si (PNL head), 02-06 CRV K24A1 (PPA head), 88-00 Civic / 90-01 Integra K-swaps using any of these cylinder heads.
This is the OG billet K series water neck flange by Tractuff. Used as an OEM replacement but better known for being used in a handful of popular fabricated filler necks, fill pots, and swirl pots for the K20A, K20A2, K20Z1 and K24A1 engines.
The neck is beautifully machined 6061-T6 flange that incorporates the largest port possible within the OEM gaskets footprint, a 1/2" NPT water bypass port, and machined o-ring groove for the OEM gasket. You can choose to have a 1/8" NPT sensor port added directly to the top of the neck (near the logo) or the side (under the outlet). The outlet itself can be configured for standard hose (1.25" OD) or -16 male flare. The hardware kit includes a 5/8" hose fitting, a plug, two stainless M6 socket head bolts, and a Genuine Honda gasket.