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DOT 407 Combination Pressure/Vacuum Relieving Vent

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3" Dot 407 Pressure Relief Vents Function
Girard Equipment, Inc.’s Three Inch DOT 407 Vents allows you to upgrade virtually any MC 307 or MC 312 tank to DOT 407 or DOT 412 venting. All the benefits of the 400 Series Vents without expensive hot-work. Flow rates are slightly less than our standard DOT 407 Vents, but are more than sufficient for most tanks.

The stainless steel valve seat seals on a Teflon® encapsulated silicone "O" Ring. This "O" Ring provides complete chemical resistance and a bubble-tight seal to meet the latest DOT requirements. The unit also meets the surge requirements of 178.345-10 (b) (3).


4" Dot 407 Pressure Relief Vents Function
Girard Equipment, Inc.’s Low Profile DOT 407 Vents combine a low profile, light weight design with increased flow rates to meet the most demanding needs of virtually any DOT 407, DOT 412, MC 307 and MC 312 tank.

The stainless steel valve seat seals on a Teflon® encapsulated silicone "O" Ring. This "O" Ring provides complete chemical resistance and a bubble-tight seal to meet the latest DOT requirements. The unit also meets the surge requirements of 178.345-10 (b) (3).

This spring-loaded, dual-acting pressure and vacuum relief vent provides much needed protection from a dangerous build-up of positive and negative forces, known as pressure and vacuum, on tank trailers transporting hazardous chemicals.

Each vent is carefully assembled and tested to each customers exact specifications.

Careful attention was paid to the design around the idea of a minimization of repair parts and a vent which could be easily disassembled with simple hand tools.




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Optional Equipment

DOT3X407T 3 in 5 1/4" over the top of the pipe nipple 11 lb 3" Stainless steel pipe nipple for connection to the tank
DOT407LT 4 in 5 1/4" over the top of the pipe nipple 10 lb 4" Stainless steel pipe nipple for connection to the tank
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