Is a U-bend/trap needed for dryer waste pipe?
My neighbour has bought a new heat pump dryer and you have the option to have a pipe to get rid of the condensation water but he's not got a pipe for the waste pipe to go into.
I'm going to pop out to get some soon but I'm not sure if I need to create a trap/U-bend or not? It'll be going straight to his drain where the sink and washer currently goes.