Stainless Steel Wafer Swing Check Valve 6" DN150 AISI316Wafer is the name of the triangular shape on the closure of the letter envelope in English. So it is used to cover the letter. Stainless Steel W..
Stainless Steel Wafer Swing Check Valve 5" DN125 AISI316Wafer is the name of the triangular shape on the closure of the letter envelope in English. So it is used to cover the letter. Stainless St..