Precast concrete manhole NON-RETURN FLAP VALVE CHAMBERS

This Marshalls CPM precast concrete chamber design includes a pre-fitted non-return flap valve installed in either a 1200mm, 1500mm, 1800mm or 2100mm diameter one-piece chamber or a 2000mm, 2100mm, 2400mm, 2700mm or a 3000mm sectional chamber system. The Marshalls CPM one-piece chamber is fabricated using a base unit complying BS EN 1917:2002.