I need to connect incoming PEX pipe to an existing copper pipe which is at a right angle. So I bought this push-to-fit for that purpose (see photo) -- pipes are 1/2". Of course these fittings have no instructions for they are targeted to be sold to (seasoned) plumbers, not rookies. So I am wondering whether some genii can explain to me the role of the white horseshoe-like plastic piece (on the bottom side it has a groove following its shape). Is it for some type of measurement? One such plastic piece is provided for the two push fits I purchased.
Speaking of measurement, how far do you push the pipes in? I imagine you can use logic and measure down from opening to where the other leg of the right angle meet, since if you push further than that you would obstruct water flow.
Another thing: The push-fits have inside (concentric) plastic pipe pieces (transparent) on both sides (see photo) smaller in diameter than the brass diameters. What are they for? I imagine they will go inside both the coper pipe as well as the PEX pipe. But, what is their role?
