The shut-off switch for the primary drain pan auxiliary outlet, Safe-T-Switch Model SS2, detects clogged A/C condensate drains and shuts off the system to prevent water damage. Can be installed on the auxiliary outlet of the primary drain pan, using the included 3/4 in. adapter. Float sensitivity can be easily adjusted without removing the cap. Easy access to the switch for service. The cap is secure and easily removed and reinstalled with tapered cams. Connect to either red or yellow wire.