Here's an easy way that doesn't risk damaging anything. Wanted to try it before I posted. The ID of a 1.5" PVC pipe is 1.6" and the OD of a 1.25" pipe is 1.67". Almost able to fit one pipe inside the other. You need to shave about .035" off the OD of the 1.25 pipe and it will slip into the 1.5". I did this with a drum sander chucked in a drill press. Took about 5 minutes. Since the junction is under water you don't have to be totally airtight. Once you're adapted to 1.25" pipe you can go to whatever the cleaner needs. Don't know if the smaller diameter and slightly added restriction will affect operation or not but it's worth a try. Cheap too. You can almost thread a 1.25" NPT male into the 1.5" pipe but I wouldn't try cutting threads as the pipe may fracture. PVC is pretty brittle. If you have a lathe the job gets easier yet.
Hope this helps.
Al
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) If you don't have all the tools to reshape a peice of pipe, you can find them {edit - pipe extenders} online (I'm sure that the link I gave is not the only place to find one - knowing that they exist is the starting point for comparative shopping) Before gluing anything into the 'return', double check that you need to (the old owners might have left the attachment fitting you need), and be sure that it's a return driven cleaner -as mas pointed out. Run the pool a few times and see if the cleaner will work without permanently having something stick out into the pool - or if you can contact the old owners, ask them what they used.
) No one where I work had ever heard of 'pipe extenders' until I had the secretary order some - who knows what fittings exist that I don't know about!?
) - Waste

