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Transparent valve physique design; totally clear valve body, observe operation problem to normal use. Double-leaf replica design, improve clumsy unmarried page design, two-page open fast, smoke-efficient. Anti-oil sticky, no leakage of smoke; silicone gasket, the use of soppy washers, stable sealing effect, stop the smell of smoke. Spring design; Check valve with spring, lengthy use, no deformation energy lasting, to nice sealing performance. Product Name: Pipe examine valve Specifications: C: Double-sided smoke pipe Colour: white Material: plastic Package Contents: 1 * Pipe verify valve Only the above kit content, other merchandise usually are not included. Note: Light and diverse reveals could cause the color of the object within the photo barely different from the genuine thing. The size allowed error is +/- 1-3cm.