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Use on Low Side of system.
Shuts off before going into vacuum,
Wire Switch in Series with Coil Wire for Low Side Protection

Can Use 530-4030 OE Switch Kit

10 Pack
R74210
Can Use 440-211B Heavy Duty Version

With Two 1/4" Male Switch Ports for Hi and Lo Side
Includes 2 Manifold O-Rings

3 1/4" Front to Rear Inside Ear Measurement

Can use Alternative Sanden Compressor - 509-5713
Can use HD SD5 Piston Compressor - 509-57153