SCHRADER-Type Valves
NOTE:
Although similar in construction and operation to a tire valve, NEVER replace a Schrader-type valve with a tire valve.
Schrader valve is similar in construction and operation to a tire valve. See Fig 1. When a test gauge hose is attached (hose has built-in valve core depressor), Schrader stem is pushed inward to the open position and allows system pressure to reach the gauge.
If test hose being used does not have a built-in core depressor, an adapter must be used. Never attach hoses or adapters to a Schrader valve unless it is first connected to manifold gauge set.
