Transparent valve body design; fully transparent valve body, observe operation condition to normal .Double-leaf replica design, upgrade clumsy single page design, two-page open fast, smoke-efficient.Anti-oil sticky, no leakage of smoke; silicone gasket, the of soft washers, strong sealing effect, prevent the smell of smoke. design; Check valve with , long , no deformation lasting, to good sealing performance.Product Name: Pipe check valveSpecifications: A: 160PVC pipe on one sideColour: whiteMaterial: plasticPackage Contents:1 * Pipe check valveOnly the above package content, other products are not included.Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.