Hybrid Racing -6 AN Water Pump Port Fitting for K20A2/K20Z

Hybrid Racing -6AN Water Pump Port Fitting - K20A2, K20Z1 & K20Z3

If you're running AN line through your engine bay, the water pump port is one of the last places you're stuck with a factory barbed hose. This fitting fixes that. It threads into the oil cooler port on your water pump and converts it to a clean -6AN connection, so you can run proper AN line to a custom oil cooler setup instead of working around a rubber hose that doesn't match anything else you've built. Black anodized, sealed with an O-ring, and it comes with a yellow zinc bolt so the whole thing goes together right.

Straight Or 90 Degree? Read This First

This is the one thing to get right before you order, because it comes down to physical clearance.

The straight fitting (HYB-WPP-01-17) works on either side of the oil cooler circuit, feed or return. If you only want to buy one part number and keep it simple, this is the flexible option.

The 90 degree fitting only works on the return side. On the feed side it runs into the block, so it physically won't clear. Plan your routing with that in mind: if you want a 90 on the car, it goes on the return, and the feed gets a straight.

What This Port Actually Does

Quick clarity, because the naming trips people up. The K20A2, K20Z1, and K20Z3 water pumps have a port that feeds your oil cooler, and despite the name, what's running through it is coolant, not oil. Your oil cooler is a heat exchanger, so coolant flows through it to pull heat out of the oil. This fitting is what connects to that circuit. Factory, it's a barbed hose connection. With this, it's -6AN.

Why Convert To -6AN

Two reasons, and both matter if you're building something you care about. The practical one is that AN gives you a real mechanical seal with a fitting you can take apart and reassemble without replacing anything, instead of a hose clamped over a barb that eventually weeps. The other reason is that if the rest of your build is AN, this is a mismatched piece sticking out. Converting it means your plumbing is consistent all the way through and you can route the line properly for a tucked bay instead of running a rubber hose wherever it happens to reach.

Works In FWD Or RWD Swaps

Since this threads into the water pump rather than mounting to anything on the chassis, it works the same whether your engine is sitting transverse in a Civic or you've dropped it into a rear-wheel-drive conversion. Any build using one of these three engines with a custom oil cooler setup or AN plumbing can use it, and RWD swaps especially benefit since the routing flexibility of AN line helps in a bay that was never designed around this engine.

Sealed Properly

It seals with an O-ring, so you get a watertight connection without relying on thread sealant or a clamp holding tension on rubber. The included yellow zinc bolt handles the mounting, and the black anodized finish keeps it looking right and resists corrosion in an engine bay that sees heat and moisture constantly. Small part, but it's built like the rest of our stuff.

Fits These K-Series Engines

These three engines share the water pump with the oil cooler port, so this fitting works across all of them, in the original chassis or in a swap. If your water pump has that port, this is the fitting for it.

Who Should Run This Fitting

This is for anyone plumbing a custom oil cooler setup or converting an engine bay over to AN line. Tucking a bay, building a track car, finishing a swap, or just tired of the one barbed hose that doesn't match everything else you've done, this is the piece that ties that circuit into the rest of your build. Pick the right angle for the side you're plumbing, thread it in, and run your line properly.

Fits: K20A2 and K20Z1 (2002-2006 Acura RSX Type-S) and K20Z3 (2006-2011 Honda Civic Si) water pumps with the factory oil cooler port, FWD and RWD applications. Converts: factory barbed hose connection to -6AN. Straight (HYB-WPP-01-17): works on the feed or return side. 90 degree: return side only, it will contact the block on the feed side. Finish: black anodized. Includes: yellow zinc bolt and O-ring for a watertight seal.