Not every radiator cap is there to hold pressure. On many vehicles, the job of pressurising the cooling system is handled by a separate cap on a remote header or expansion tank, leaving the radiator filler neck needing nothing more than a solid, airtight seal. That's exactly what the Tridon TRC11 is made for.
This blanking cap has no pressure or vacuum valve. It simply closes off the filler neck completely, keeping coolant in and air out, so the rest of the system can do its job. It's made from metal with a small bayonet fitting that pushes down and twists to lock, and at just 8 mm tall it sits low and neat, much like the original.
Because it doesn't regulate pressure, the TRC11 must only be fitted where the vehicle manufacturer calls for a blanking cap. Fitting one in place of a pressure-rated cap will leave your cooling system unpressurised and can quickly lead to boiling and overheating. If your original cap has no pressure rating stamped on it and your vehicle has its pressure cap elsewhere, this is likely the one you need. Check fitment for your vehicle before ordering.
- Series - TRC
- System - Blanking
- Cap Style - Metal
- Connection Type - Small Bayonet
