Hi Allen,

I have just de-commissioned my holding tank system and have my tank at home.
the dimensions are 550mm wide x 220mm deep x500mm high the bottom drops another 50mm as a sump. the sump has a 40mm dia pipe 85mm long.
The top has a hand hole access and a breather pipe which is 40mm to the top.
hope this is of help to you.
regards
Ian
Bavaria 34