Product Description Features: The test plug is designed to sit on of the drain pipe with a neoprene gasket to create an airtight seal. The larger wing nut makes tightening and removal quick and painless. Metal panels are stronger and less likely to rust. 4 inch size fit for most regular water pipes. Specification: Main material: Rubber+metal Color: As Shown Size: 11 x 9.6 x 7 cm/ 4 x 3.7 x 3 inches Suitable for: Various materials 4 inch water pipe Package Contents: 1 x pcs plumbing tools Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.