Check the listing for details. Stainless Steel RO Membrane Housing NYLON End Cap 1/2" x 3/4". Color: Black, Condition: New. Listed at 24.95 USD. Reverse osmosis water filtration systems may preserve and enhance the performance of their 4" x 40" stainless steel membrane housings with the help of the 1/2" x 3/4" stainless steel RO Membrane Housing Vessel End Cap. It is also made of sturdy black plastic (NYLON), and the end cap guarantees a tight, corrosion-resistant seal. On top of that, the 4" End Cap has a 1/2" Permeate port with NPT threads and a 3/4" Feed or Waste port that works with typical membrane housings. In addition, two working outer O-rings and two already-installed inner O-rings contribute to the creation of a water-resistant seal. Finally, if someone would want to easily upgrade their plumbing department, this Stainless-Steel RO Membrane Housing Vessel End Cap. Specification:Material: NYLONColor: BlackMax Working pressure: 300 psi Feed/concentrate Connection: supports both 1/2"&3/4" Feed and Drain Ports (FNPT inlet)1/2" Permeate Ports (FNPT outlet) Package included: 1: 1/2" x 3/4" Nylon End Cap