MATERIAL: Made of rubber, with excellent expansion and recovery.Recommended inflation for daily use: 30 PSI !! SIZE: The diameter of the rubber plug is 1.75 IN in the non-inflated state. The maximum diameter expands to 2.25 IN when 40 PSI air pressure is applied. PRODUCT DESIGN: The copper valve core wrench can loosen the internal valve core when deflation is needed. Deflation is convenient and quick. The 2.34 IN ring diameter prevents the rubber plug from falling into the pipe when deflated EASY AND CONVENIENT TO USE: Just insert the inflatable plug ball into the drain pipe, slowly inflate it with a standard bicycle pump, then drain the water into the pipe and start testing. When the pipe plug balloon is deflated correctly, just pull it out. APPLICABLE SCENARIOS: Pipe test balloon plugs are very suitable for shower drains/floor drains/bathtub pipes/bathroom pipes/toilet tees/swimming pool pipes/underground drains/underground sewage pipes Colour:As Shown Material:rubber Due to different batches, there may be differences in product appearance and printed text, which not affect use Package Contents: 2 * Pipe Pressure Test Plug 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.