Inspection Hatch

Allen inspection hatch covers in black, grey or white. Allen have three different designs, A.137 and A.237 are non 'O' ring original design with exposed fixings, the A.337, A.537 and A.637 require a rubber 'O' ring and the more rigid A1737, A1837 and A1937 feature a fully threaded cover with integral seal. 
 
Utilizing a number of different designs and sealing methods Allen have created an optimized range that is both easy to fit and watertight.