The RV water heater thermal cutoff kit can effectively regulate the water temperature of the RV, designed to prevent an accident by ensuring water temperature does not rise above specified temperature, so you can avoid scalding due to high water temperature. This Insulation Kit Provides a Reliable Fusible Link That Keeps the Water Heater in Top Condition and Effectively Provides You with Hot Water, and ECO thermostat assembly can work well to prevent accident. with a detailed user manual, Just place thermostat at the right cutout and ECO at the left cutout, replace spring and washer, cover with foam cover and reconnect the wires. Compatibility: The water heater thermal replacement part kit is compatible with for 21140, 9-72153, for 45518A2, 45518A3 , 45518A1,GCH6-, GH6-8E, G6A-6E, G6A-7E, G6A-8E, GCH6A-7E, GC6AA-7E, GC6AA-8E,GCH10A-2E,GCH10A-, G10-1E most electric such and more. Colour:Photo Color Material:plastic+metal Package Contents: 4 x fuse 2 x wire 2 x Temperature control 1 x black foam cover Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.