I need to replace the trap that was connected to a shower tray in 1968. This trap, which is a shallow type, is made from copper, and has become perforated with a dozen small holes on the waterline of the water retained in the trap.
The snag is that the nut that connects the trap to the tail of the waste outlet is seized up, and I can not move it. The shower tray seems to be made from glazed clayware (also from 1968), so heating the seized up nut is not an option.
Can anyone suggest a way of tackling this problem?
Regards.