PRODUCT DETAILS
Honda K20A2/A3/K24A1 PRB Water Outlet Neck (19350-PRB-A00)
This genuine Honda PRB water outlet neck (OEM part number 19350-PRB-A00) is the correct piece for K20A2, K20A3, and K24A1 engines. It’s the same style neck that came on the 2002-2006 Acura RSX, 2002-2005 Honda Civic Si, and 2002-2006 Honda CR-V, so you’re getting a proven, factory-quality part—not some mystery casting. If you’re chasing an OEM PRB water outlet neck for a K Swap build, this is the clean, “bolt it on and forget it” option.
The PRB Honda K20A2 water outlet neck uses a cast aluminum body to route coolant from the cylinder head to the rest of the system. The factory shape and bolt pattern mean it drops straight onto K20A2, K20A3, and K24A1 engines with no drilling, slotting, or weird fittings. If your original K24A1 Honda water outlet or K20A3 engine water neck is cracked, corroded, or seeping around the gasket, swapping to this 19350-PRB-A00 PRB neck gets your setup back to how Honda intended.
This is the same style piece people hunt down for a clean K Swap build water neck, especially when you want proper hose routing in a Civic or older chassis. Whether you’re doing a 2002 Honda RSX coolant outlet refresh, a 2006 Civic Si water neck replacement, or you just want an Acura RSX genuine water neck or Honda CR-V genuine water outlet you can trust, this 19350-PRB-A00 K swap fitting keeps coolant moving and leaks under control. We run genuine PRB necks on our own K builds for exactly that reason.
The coolant neck is sold without the needed gasket, so make sure to pick up the K20A2/A3/K24A1 Water Neck Gasket.
Key Features
- Genuine OEM Honda part: 19350-PRB-A00
- Correct for K20A2, K20A3, and K24A1 engines (K20A2 cooling system neck)
- Direct fit on 2002–2006 Acura RSX, 2002–2005 Honda Civic Si, and 2002–2006 Honda CR-V
- Perfect for OEM PRB water outlet neck replacement or K24A1 water outlet use in K Swap builds
- Restores proper coolant routing and sealing at the cylinder head
If you’re done dealing with sketchy castings or hacked fittings, this Acura RSX water neck part is the straightforward way to fix your Honda Civic Si coolant neck and keep your K series cooling system doing its job.