Civacon | Knappco | Sure Seal

HC 20" Pressure/Vacuum Tank Hatch

20” Pressure / Vacuum tank hatch for bulk storage tanks-silos, grain elevators, baghous for cement, food products, grain, industrial products.


  • Features and Benefits
  • Model Numbers
  • Bolted flange base, full opening
  • Dependable design
  • Easy to maintain
  • 291 sq. in. free area of product can be emitted when relieving pressure
  • HC1110  20” Pressure/Vacuum Tank Hatch, Cast Aluminum Base & Cover, w/2 oz. Dome 1 oz
  • HC1111  20” Pressure/Vacuum Tank Hatch, Cast Aluminum Base & Cover, w/2 oz. Dome 4 oz
  • HC1112  20” Pressure/Vacuum Tank Hatch, Cast Aluminum Base & Cover, w/2 oz. Dome 5 oz
  • HC1113  20” Pressure/Vacuum Tank Hatch, Cast Aluminum Base & Cover, w/2 oz. Dome 6 oz
  • HC1114
  • HC1120  20” Pressure/Vacuum Tank Hatch, Cast Aluminum Base & Cover, w/1 oz. Dome 1 oz