A tub spout can slide over a smooth pipe and fasten with a set screw, or thread onto an adapter. The mounting method matters when selecting a replacement. Twisting a slip-on spout can strain the pipe or the fitting behind the wall.
Look at the underside without removing the spout
Use a flashlight to check for an opening near the wall. A screw visible in the opening is a useful clue. If you cannot see a screw, share photos and the model if known, since trim can conceal the fastener.
Confirm the connection before ordering
Ask the plumber to identify the mount and check how far the pipe projects from the wall. Compare that measurement with the new spout instructions so the trim sits correctly without stressing the connection.
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