Valves intended to prevent reversal of flow must be automatic in operation. However, on equipment used exclusively for fueling aircraft, such valves may be manual in operation.
Okla. Admin. Code § 165:15-15-43
Valves intended to prevent reversal of flow must be automatic in operation. However, on equipment used exclusively for fueling aircraft, such valves may be manual in operation.
Okla. Admin. Code § 165:15-15-43