Floater, Floating Beads, Cenospheres manufacturer / supplier in China, offering Floating Beads/ Cenospheres/Flying Ash Hollow Ball/Hollow Microsphere/Zeeospheres/Floater, Qyk21-25 Hydro-Pneumatic Pressure Switch Qyk21-25/Qyk21-40 Two Position Two Way Reversing Valve/Position Selector Valve Qyk21-25 Relief Valve Qyk21-40, Qky21-25 Pilot Air Valve Made by Shanghai Shenkai Qky21-25, Qky21-40 and so on.