Compression fittings: Such a fitting involves slipping a threaded brass nut over the end of the PEX tube, followed by a tapered plastic compression ring (see on SupplyHouse). A hollow brass tube is then inserted to the conclusion with the PEX tube. Eventually, consulting with an expert plumber or contractor https://wholehouserepipe53198.wikimillions.com/3753939/pex_repipe_no_further_a_mystery