Have a difficult solder job to do. 15mm tube is partly buried in a shower wall. Access and hence flame control is difficult.
A threaded brass coupler is to be solded onto the tube. The solder end has a standard end feed slide female socket. No problem there, but the other end has a female 3/4in thread which must be kept clear of solder.
Is there a method of coating the brass to stop solder running into the thread?
Or some other suggestion please.
TIA