We offer discount for big quantity. Welcome to touch with us! Transparent valve body design; totally clear valve body, notice operation concern to guarantee usual use. Double-leaf replica design, upgrade clumsy single web page design, two-page open fast, smoke-efficient. Anti-oil sticky, no leakage of smoke; silicone gasket, the use of soppy washers, solid sealing effect, prevent the smell of smoke. Spring design; Check valve with spring, long use, no deformation power lasting, to guarantee nice sealing performance. Product Name: Pipe confirm valve Specifications: B: 160PVC pipe at either ends/C: Double-sided smoke pipe/A: 160PVC pipe on one side Colour: white Material: plastic Package Contents: 1 * Pipe investigate valve Only the above equipment content, different merchandise shouldn't included. Note: Light shooting and various displays may cause the colour of the thing within the photograph a little diverse from the genuine thing. The size allowed error is +/- 1-3cm.