Precision Works K Series Filler Neck Upgrade For Upper Coolant Housing For K20

Transform your K20 cooling system with this performance-oriented upgrade that eliminates restrictive factory components. This direct-fit filler neck conversion allows you to integrate an optional filler neck into your upper coolant housing for improved coolant flow and easier maintenance access.

• •16AN fitting compatible with AN radiator hose systems
• •Type B radiator cap compatible
• •Works exclusively with Precision Works K20 Upper Coolant Housing with Hose Fitting
• •Converts non-integrated factory design to fully integrated performance setup
• •Bolt-on installation for K-series engines

Perfect for K20 builds prioritizing cooling efficiency and custom engine bay layouts. A must-have upgrade for serious performance enthusiasts optimizing their K-series cooling system.