ChinaBrassSpringCheckValveManufacturs Details Brass Valve Body: High-density forging, no blister, no air holes, no leakage. Made by special high precision CNC machines. Brass Bonnet: High-density forging, no blister, no air holes, no leakage. Made by special high precision CNC machines. Brass Flap: With hard sealing structure, is not easy to abrade after long-term use, with excellent sealing...