Feature●BRASS MATERIAL: This check valve is made of high quality brass material, so the check valve is durable and sturdy.●EASY OPERATION: Convenient to use and easy to install, there is an arrow mark to show direction.●DN20 INTERNAL THREAD: This check valve adopted a DN25 standard internal female thread which will suit for many connections.●PERFECT WATER CHECK VALVE: Nominal pressure is 232psi, perfect water check valve.●ONE WAY CHECK VALVE: This is a check valve that allows water to flow through it in only one direction, widely used in many places.Description