Three Phase Compressor Pressure Switch With Air Regulator & Gauge & Value Compressor Pressure Switch With Air Regulator & Gauge & Value The Compressor Switch Has 4 x 1/4" Bsp Ports Compressor Pressure Switch Dimension:9 x 5.5 x 13cm(l x w x h) Gauge Diameter:40mm, 50mm Height Of Air Regulator:7cm