The C402 Series internal valves have three side outlets and an integral strainer for pump protection. The three outlets allow convenient pump installation and also provide extra openings for tank evacuation. In bulk plant installations, the C402 Series valves allow cylinder filling and truck loading from a single outlet.

Threaded internal valves like the C402 Series have a compact one-piece body design, and are suitable for LP-Gas (Propane) or ammonia service. They can be actuated manually, by cable control, or with an air cylinder.

The C403 Series flanged internal valves are intended for special bobtail truck applications where the pump must be lowered to clear the truck frame or other obstacles. A shear section in the body permits the lower section of the valve to shear off in the event of accident, leaving the critical shutoff parts within the tank.

The C403 Series valves can be activated manually, by cable control, or by an air cylinder. These units have an internal screen for pump protection which can be removed if the valve is used for filling.

The C404 Series flanged internal valves are widely used on bobtails, on in-line installations, and on large storage tanks. These units provide a sturdy and compact means of direct pump or piping connection, and are designed to shear off in the event of accident, leaving the valve intact.

Available in 3-inch and 4-inch sizes, the C404 Series are constructed of stainless steel for maximum resistance to rust and corrosion for longer service life.

Threaded internal valves like the C407 Series are an excellent choice for vapor lines on bobtail trucks. They can also be used as a main valve on small capacity pumping systems, ammonia nurse tanks, and in-line installations.

The C407 Series valves comply with the MC-331 specifications, and with NFPA 58 requirements for protection of transfer hose or piping at bulk plants.

The C421 Series internal valves are designed with two outlets, bottom and side. The side outlet permits installing horizontal piping immediately adjacent to the tank without the need for extra pipe fittings. Primary use for the C421 Series is on bobtails and transports.

These units are designed as primary shutoff valves and to reduce the chance of uncontrolled product discharge in the event of an accident. Like all Fisher threaded internal valves, all C421 Series are suitable for both LP-Gas (Propane) and ammonia, and comply with NFPA 58 requirements.

The C427 Series internal valves are economical, compact valves with straight through flow. They are suitable for LP-Gas (Propane) or ammonia service, and special construction is available for other compressed gases. Common installations include bobtail, transport, stationary tank, and in-line.