16″ Betts Offset Manhole Cover, DOT 406 Pressure Relief Device

  • Integral relief valve – 10″ fill
  • Less than 1 litre leakage.
  • Set pressure adjustment.
  • Increased flow rate.
  • Secondary safety latch.
  • Ships with buna gasket.
Weight: 24 kg


Manhole covers are 7 gage steel or stainless and are secured to the tank weld collar with a clamp ring and bolt which can be easily removed to provide access into the tank.

PAF manholes with integral latch style surge suppression relief valves are designed for use on DOT406 specification cargo tanks. Manholes are certified and marked in accordance with 49CFR178.345-5 with a test pressure of 36 psig.

Pressure Relief Valve setting 3.63 psig
Rated Pressure Actuated Emergency Venting:
494,084 cu. ft. free air per hour @ 6.25 psig
Rated Liquid Flow Capacity 1335 gpm @ 5.0 psig