I recently purchased a Whirlpool Water Filtration System. I am installing it into a new construction. We have 3/4'' CPVC main line. The back of the filtration system uses a 1'' male threaded connection. I have to use this connection into the filtration system since it has "special clips" that hold this male end into the unit. My question is, how do I run 3/4'' line down to the 1'' male end? I am thinking about using 3/4'' PEX tubing down to it, but I can't seem to find a 3/4'' to 1'' female connector end to make the final connection. I looked at the Sharkbite connectors and even looked at using more CPVC instead of PEX, but can't find an end for the CPVC either. Lowes, HomeDepot, nor Menards seems to have what I need. Any advice? Thanks!