man door hatchHatches are available in various thicknesses to suit sealing stoppings.  This hatch is designed so it is rated at 50PSI prior to concrete filling.  Once the installation is complete and all doors have been bolted shut the hatch can be left for filling at a later time and still be rated at 50PSI.

20 or 50PSI

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coffin sealman door 900mm x 900mm