This thermocouple and tilt switch is designed to solve the problem of the pilot light NOT staying lit. Works with outdoor propane patio heater, freestanding patio heater, tower glass tube heaters, tabletop propane patio heater, Bay window heater, etc. Easy to install, just connect the 2 wires together to bypass it. The thermocouple has a full extension length of 350mm with temperature resistant sleeves. It has a fixed M8 x 1 thread head with end thread nuts compatible with 8mm gas valves. High quality replacement parts thermocouple control and tilt switch safety kit for patio heater High quality - Protect yourself with high quality patio heater replacement parts that you can install in minutes. Tilt Switch: Made of sturdy ABS plastic, which automatically shuts off the heater when the gas heater is tilted. Thermocouple: Made of high quality brass and red copper; Save time and effort with pre-assembled thermocouple and relief switch kit, simply connect the 2 wires together to bypass it.