Fits Most Standard Home RO Membranes: 1.5-1.8″ Dia. × 10-12″ Length Membranes (10-150 GPD) Constructed of High Quality Polypropylene Double O-Ring Included. We offer standard home RO membrane housings used for point of use and under-the-sink systems and whole house food grade membrane housing that fit standard 1.5”, 1.85” and 3” home membranes, Our residential housings are reliable and ensure optimal performance in home reverse osmosis systems. Standard size (Membrane Dimensions: 11. 75″ x 1. 75”) Compatible with most RO system filter replacement on the market, easy to install, no tools required. Advanced membrane technology with innovative thin layer composite membrane design.