- Reliable O-ring seal.
- Pressure warning lock alerts operator to internal pressure prior to opening the closure.
- Primary door seal releases before threads are completely disengaged, also warning operator that internal pressure is present.
- Simple, economical design.
- What makes the design of the D-500 threaded closure so simple? The D-500 threaded closure includes just four main parts: door, pressure warning lock, primary O-ring seal, and barrel collar.
- What sizes are available with a horizontal hinge? Horizontal hinges are standard on sizes 10 inches and larger, and are optional in 4-inch, 6-inch, and 8-inch closures.