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        Q: Loosening a Threaded PVC Fitting From Copper Fitting?
A: Due to the variance in the CTE 's of PVC and copper , refrigerating the fittings will make things tighter . 

Q: Connecting 4\" PVC Pipe Into 6\" HDPE Pipe?
A: Like a hot water system , refrigerated water will is passing through thermal cycles . As the piping alternate between being hot & amp ; cold the PVC and copper will expand and contracting . The problem , which is is that plastic and metal broaden at different rate .   If you use males and females threading adaptors on every type of piping you will join them together , but the joint will eventually leak . The various sums of the expansion of one material threaded into the other will cause the threading of the softer material to deform thus slackening the joint and arousing it to leak .   Threaded adaptors 're for adapting un-threaded piping to a thread connection of the same material . Like a PVC piping into a PVC filter housing that has threaded connexions .    To connect metal piping to plastic piping you required to use a particular fitting destined for the job that are able handle the different enlargement rate and maintain a seal . There 's two basic types , a transitioning union or a Copper to PVC adaptor .   Each type enabling some mechanical movement because of thermal enlargement whilst maintaining a water tight seal . 

Q: What kind of pvc will fit into a 1-1/2inx2ft pvc pipe?
A: I happens to is operating in the plumbing dep . at lowes and the piece you 're 're looking for 's called a bushing . the actual issues in what 's you adaptation to ?