Sitting between the common 16 PSI and higher 18 PSI ratings, the Tridon CB17120 suits cooling systems that call for 17 PSI (120 kPa). Getting that number right matters: too little pressure and your coolant boils earlier than it should; too much and you're putting extra strain on hoses, seals and the radiator core. This cap is built to hold exactly what the manufacturer specified.
It's a metal, double-seal recovery cap with a small Japanese bayonet fitting, the push-and-twist style found on many Japanese cars, utes and 4WDs. Inside, a pressure valve opens to send expanding coolant into the overflow bottle, and a separate vacuum valve lets it return as the engine cools. The result is a system that stays topped up and air-free between services, without you needing to constantly check levels.
A radiator cap is easy to overlook, but it's often the first thing to check when you notice coolant disappearing, a sweet smell after a drive, or a temperature gauge creeping higher than usual. At around 24 mm tall with an OEM-style design, the CB17120 slots straight in where the old one came off.
- Series - CB
- Pressure - 17 (PSI), 120 (kPa)
- System - Recovery
- Cap Style - Metal
- Connection Type - Small Japanese Bayonet
