Allen Small White Hatch Cover - Rigid with
Integral Seal (4 inch)
Polypropylene inspection hatch covers in
black, grey or white.
We 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.