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Transparent valve body design; completely clean valve body, be aware operation problem to ensure regular use. Double-leaf duplicate design, upgrade clumsy single web content design, two-page open fast, smoke-efficient. Anti-oil sticky, no leakage of smoke; silicone gasket, the use of sentimental washers, stable sealing effect, forestall the odor of smoke. Spring design; Check valve with spring, lengthy use, no deformation strength lasting, to ensure nice sealing performance. Product Name: Pipe verify valve Specifications: C: Double-sided smoke pipe Colour: white Material: plastic Package Contents: 1 * Pipe verify valve Only the above package content, other merchandise will not be included. Note: Light taking pictures and sundry reveals may cause the colour of the article within the photograph somewhat assorted from the genuine thing. The dimension allowed error is +/- 1-3cm.