Get your Nipple Fitting to connect to your water filter housings, these fittings are what we use for ProSeries reverse osmosis drinking water systems and Fleck water softeners.
Our nylon hex nipple fitting has male NPT connections on both ends and is made of durable nylon that works with all materials like PVC, CPVC, PEX, copper, brass, and any other place this size of plumbing is used. These fittings are commonly used between filter housings on drinking water filters and reverse osmosis systems.