The iSpring feed water Adapter connects between the cold water Supply multi-turn angle valve and flexible riser pipe, to the main water Supply, for applications in reverse osmosis filtration systems, automatic coffee brewers, ice makers and many more. The included Conversion Adapter (busing) can be threaded onto either side of the valve to make the configuration of 3/8 inch x 3/8 inch comp or 1/2 inch x 1/2 inch NPT. Please read these instructions carefully before installing this product and refer to the water filter installation guide.