I am installing a laundry pump in my basement and have to connect to my 3" waste line which is 5 feet off the floor. I bought two pvc repair couplings at a plumbing supply store to connect my sanitary tee to the main. These fittings go over the 3" main but are very hard to slide on my new pvc set-up. Do I prime and glue the main and hope to slide these couplings over my joints or can I use two rubber flex couplings with clamps to put it all back together? Any info would be appreciated.

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These fittings go over the 3" main but are very hard to slide on my new pvc set-up.

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Please describe the "new PVC setup" that the PVC coupling won't fit over. If you don't wish to use the PVC couplings I wouldn't use a flexible rubber coupling. Go with a No-Hub or a Shielded Coupling. (see images) More support then a rubber coupling, good luck, Tom

I cut the existing 3" and added a "y" fitting to a new lenght of 3" pvc. I bought two new repair couplings at a different supply house( diff brand also) and these two slide right over my new pvc. I guess I glue both sides of the joints and slide these acrosss?

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I bought two new repair couplings at a different supply house(

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Please describe the couplings. Are they PVC or metal bands"

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I guess I glue both sides of the joints and slide these acrosss?

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Slide what across? Regards, Tom