If you are going to buy cheap,Website:://.airkir.com, newest and high-quality oxygen concentrator regulator products from one productive factory, Fenghua Airkir Pneumatic Equipment Co.,Ltd is one of the professional oxygen concentrator regulator manufacturers in China.We are the professional manufacturer of oxygen concentrator regulator,theregulator is used widely in oxygen concentrator,1plm,3plm,5plm,10plm and so on.It has got National Award for outstanding new product.It is low pressure valve special for medical system.We use special silica gel to extand the serrice life.