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D-500 Threaded Closure 

D-500 Threaded Closure 
D-500 Threaded Closures are an economical solution for providing quick, easy and safe internal access to pressure vessels (pig traps, filters / strainers, blow downs). With quick delivery and optional features, D-500 Threaded Closures will become your small diameter closures of choice.

- Easy installation
- Without hinge 2” - 8” (standard)
- Horizontal hinge 10” - 14” (standard)
- Horizontal hinge 4” - 8” (available as special order)
- Vertical hinge 4” - 14” (available as special order)
- Door easily opened and closed with standard tools – no special tools or hammering required
- Large cross-section O-ring maintains positive seal
- Pressure warning lock (standard on all sizes) alerts operator to internal pressure before opening door
- Primary seal released prior to door being completely open for added safety
- All closures are furnished with material test certifications upon request
- Quick delivery
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