Universal radiator pressure test cap kit utilising a set of rubber adaptors that fit over an expandable plug to allow radiator and expansion tank filler necks to be plugged for pressure testing. Kit includes: 1 universal adaptor & 3 expandable rubber rings: OD 35 x ID 30mm, OD 39.5 x ID 30mm, OD 44 x ID 30mm.Can be used with Laser Pump, Part No. 1735 & Laser Cooling System Pressure Test Kit, Part No. 5614 for pressure testing. Refer to vehicle data for maximum operating pressure. Designed to seal on the parallel area within the filler neck.