This float switch is used to detect condensate overflow. It can be installed on the main and auxiliary drain trays. It consists of a float and spring switch with a bracket design: SS3 float switch uses a water-sealed magnetic spring switch. Rising Water in Drain Line,Unit stop when float is lifted. Reliable quality: The use of stainless steel bracket, not easy to be corroded, installation is also more convenient, can be firmly clamped on most of the edge of the drainage tray Instructions for use: SS3 can be mounted on the main drain tray or auxiliary drain pipe, and the included wire is connected to the HVAC system, which automatically turns off the HVAC system when the float switch is activated Color: Black Material: ABS Package Contents: 2 x SS3 Condensate Drain Pan Switch 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.