Does anyone know what the height/depth of a plastic base inspection chamber is for both 300 to accept 110mm pipe, and 450mm to accept 160mm pipe for foul & surface water?
Due to shallow fall over a long run to the mains, I need to keep the first inspection chamber from the house as close to the finished path surface as possible. I've allowed 300mm from the finished surface to the invert for the 450mm foul chamber. I'd prefer the surface water chamber to be shallow also.
Can the lid fit direct to a base or do they require so many spacer rings to avoid blockage?
Due to shallow fall over a long run to the mains, I need to keep the first inspection chamber from the house as close to the finished path surface as possible. I've allowed 300mm from the finished surface to the invert for the 450mm foul chamber. I'd prefer the surface water chamber to be shallow also.
Can the lid fit direct to a base or do they require so many spacer rings to avoid blockage?