I have put 3 photos on flickr which show the problem:-
- The dishwasher waste enters from the left at the lower T but appears to have no trap(?)
- There is a leaking split at the upper swept T which is solvent welded. Probably caused by 3.
- The washing machine waste has its own U-bend but is unsupported.
I could replace the sink trap with one with appliance hose connector but would need then to somehow blank off the unused T (dunno how).
Looks like I would have to cut main waste pipe below the lower T and start again...
Any other ideas gratefully acepted...