... Device4. Blow-out Proof Stem5. Fire Safe Design6. Emergency Sealant Injector7. Vent Valve, Drain Valve8. Lifting Lugs and supporting ... Yongjia, Wenzhou, Zhejiang, China, It is a professional valve manufacturing enterprise, which integrates R&D, manufacture and sales. ... the best OEM partners of the other international brand valve producing corporations. With first-class quality, excellent performance ...