LEFOO LF40 Pressure Switch for Spa / Hot Tub Pump and Food Waste Garbage Disposal Alternate action, 1.0-1.8PSI Contact Arrangement:SPDT. Connection: Inlet 4.0mm for tube connection,with 1/4NPT fixed nut. Electrical Rating: 22A,125/250VAC. Media: air or non hazardous gas or liquid.