Found a small leak at the junction of of the 1.5" PVC where it exits my pump. It appears to be a threaded connection. Is it possible to simply unscrew the connection and either replace or add teflon tape and retighten? Or, should I plan to cut the PVC, remove the threaded connection, replace it and join it with a coupling or union? Haven't tried to unscrew it yet as I didn't want to damage it. Thanks for your advice!