Real-time Monitoring: Water heater vapor sensor kit can detect the change of steam concentration in real time, and once the steam concentration is found to exceed the threshold, the system prompt you in time, so that you can find the problem in time and take better action, let you can use the water heater more safely Water and Dust Proof: vapor sensor kit is made of metal and plastic material, with excellent waterproof and dust-proof function, resistance, wear resistance, high temperature resistance, can work in a variety of conditions for a long time stable, reliable and Compatible Models: Water heater vapor sensor kit fit for Ruud FVIR water heater, replace SP20172, sensor replace AP13447-3, cap plug replace AP13450-3, please confirm the item model before purchasing Stable Performance: vapor sensor kit can help you avoid problems such as leaks in time, keep your water heater always maintains stable performance, and quickly provide you with sufficient hot water when you need it, let you enjoy a more secure and reliable hot water supply Easy to Install: You get: 1 x vapor sensor, 1 x cap plug, 1 x 6 inch wire tie; size: 6.7 x 2.7 x 9.4 inches; items can be installed directly, plug and play, and pass quality inspection before leaving the factory, which is a good helper to let you rest that you can use the water heater Color: White Material: plastic Package Contents: 1 * Vapor Sensor Kit 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.