The first port through which water enters the solenoid valve body.
Directly connected to the water line after the pump (Pump Outlet) or from the feed line depending on the filter design.
Equipped with either a Push Fit or threaded connection to securely hold the tubing.
When in OFF (Closed) position: prevents any water from entering.
When in ON (Open) position: allows water to flow into the solenoid body.