Pressure and Watertight Manhole Covers

Watertight Assembly Watertight castings are gasket sealed with a bolted cover. These manholes are suitable for low pressure, gas or steam tight applications. Pressure Tight Bolting Pressure tight bolting, very similar to watertight bolting, are suitable for low pressure applications up to 20 p.s.i. Frost Proof If a manhole is frost proof it has an extra inner cover, such as the one below. The typical inner cover has a neoprene gasket around the edge and a locking bar with tightening screw. When the locking bar is tightened the gasket creates an extremely tight seal to the sides of the frame which does not allow frost, debris, and other containments inside.