We have water leaking from the two tap/valves used for draining the fresh & grey water. Since fiddling with them it's now leaking more 
I discovered there's a split in the black pipe feeding the valves and suspect the valves are fine. The pipe is about 30mm diameter but I suspect this is likely to be the wrong stuff!
Can anyone suggest a more suitable pipe or identify the pipe being used?
Thanks
John

I discovered there's a split in the black pipe feeding the valves and suspect the valves are fine. The pipe is about 30mm diameter but I suspect this is likely to be the wrong stuff!
Can anyone suggest a more suitable pipe or identify the pipe being used?
Thanks
John