Transparent valve physique design; totally clean valve body, note operation condition to guarantee usual use. Double-leaf reproduction design, improve clumsy unmarried website design, two-page open fast, smoke-efficient. Anti-oil sticky, no leakage of smoke; silicone gasket, the use of soft washers, solid sealing effect, stop the heady scent of smoke. Spring design; Check valve with spring, long use, no deformation power lasting, to assure nice sealing performance. Product Name: Pipe confirm valve Specifications: C: Double-sided smoke pipe Colour: white Material: plastic Package Contents: 1 * Pipe test valve Only the above kit content, diverse merchandise are usually not included. Note: Light capturing and diversified displays could cause the colour of the item in the photo slightly various from the genuine thing. The length allowed error is +/- 1-3cm.