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Transparent valve physique design; completely transparent valve body, be aware operation situation to guarantee normal use. Double-leaf reproduction design, upgrade clumsy single website design, two-page open fast, smoke-efficient. Anti-oil sticky, no leakage of smoke; silicone gasket, the use of soppy washers, stable sealing effect, give up the scent of smoke. Spring design; Check valve with spring, prolonged use, no deformation strength lasting, to guarantee nice sealing performance. Product Name: Pipe check valve Specifications: C: Double-sided smoke pipe Colour: white Material: plastic Package Contents: 1 * Pipe confirm valve Only the above kit content, different item are usually not included. Note: Light capturing and various exhibits can cause the color of the thing in the photo a little bit diverse from the real thing. The size allowed error is +/- 1-3cm.