Hybrid Racing PRB FWD Coolant Port Adapter - RSX/EP3/CR-V

HYB-CPA-01-06 - Hybrid Racing PRB FWD Coolant Port Adapter - RSX/EP3/CR-V

Clean up your PRB-head K-series cooling system

The factory coolant outlet on a PRB cylinder head is bulky and incorporates the idle air assist valve, adding extra hoses and fittings to the back of the engine. Hybrid Racing's FWD coolant port adapter replaces the complete assembly with a compact, fully machined housing made from a single piece of 6061 aluminum and finished in black anodizing.

The threaded -16 ORB outlet works with the included hose-barb fitting for a factory-style radiator hose or with a -16 ORB to -16 AN fitting for a complete AN-plumbed cooling system. A 1/8-inch NPT port provides a clean location for an aftermarket coolant-temperature sensor and can be sealed with the included plug when not in use.

Flexible Cooling and Sensor Routing

• Designed specifically for front-wheel-drive PRB-head K-series applications
• Deletes the factory idle air assist valve and its associated plumbing
• Use a factory-style radiator hose or convert to -16 AN plumbing
• Retains the factory thermostat bypass circuit for proper warm-up flow
• Includes a 1/8-inch NPT port for an optional coolant-temperature sensor

Key Features:

• Fits PRB-style K20A, K20A2, K20A3, K20Z1, and K24A1 cylinder heads
• Single-piece billet 6061 aluminum construction
• Durable black anodized finish
• -16 ORB coolant outlet
• Works with the included hose-barb adapter or an aftermarket -16 AN fitting
• Machined pocket uses an OEM-style rubber seal with no RTV required
• Fully machined internal coolant passage promotes smooth, unrestricted flow
• Includes gasket, fittings, sensor-port plug, and mounting hardware

Vehicle Fitment:

• 2002-2006 Acura RSX (K20A/K20A2/K20A3)
• 2002-2005 Honda Civic Si EP3 (K20A3/K20Z1)
• 2002-2006 Honda CR-V (K24A1)

Also compatible with applicable front-wheel-drive swaps using a PRB-style K-series cylinder head.

What's Included:

• (1) Billet coolant port adapter
• (1) -16 ORB to hose-barb radiator fitting
• (1) Threaded heater-hose fitting
• (1) Plug for the 1/8-inch NPT sensor port
• (1) OEM-style sealing gasket
• Mounting hardware

Whether you are deleting the idle air assist valve, adding a dedicated coolant-temperature sensor, converting to AN plumbing, or simply cleaning up the engine bay, this adapter provides a compact and serviceable solution without sacrificing coolant flow or thermostat-bypass operation.