A mechanical vacuum/or cable operated valve designed to thermostatically regulate the flow of water from the engine to the heater core.
NSN 6145-01-491-6785
NSN 6685-01-097-8770
NSN 4140-01-323-4279
NSN 5996-00-185-1372
NSN 6645-00-079-1430
NSN 2925-01-528-7333
NSN 5965-00-455-7581
NSN 6610-00-081-2365
NSN 5975-00-999-9388
NSN 6135-00-593-6831
NSN 6145-00-154-1360
NSN 6645-01-480-3962