Wenzhou Zhitong Pipe Co.,Ltd is one of the professional female thread check valve manufacturers and suppliers in China,Website:http://www ... check the price with us. Product Overview The female thread check valve of Anix has simple structure, small volume, light weight, ... the seal ring is normally removable. There are various types of thread for selection: G·NPT, BSPT, BSP DIN259/2999. Design ...