Unlike some of the competitors that sell a cheaper version, Daytona Sensors sell a genuine, high quality MAC solenoid valve with Viton seat. They supply the solenoid valve with a sintered brass filter for the exit port. Most competitors install a simple mesh screen. The brass filter provides complete protection against ingress of dirt particles. Before you buy another solenoid valve, look for the MAC logo. If you don't see it, you are getting a cheap copy with a rubber seat that will quickly fail.