Cherne 270178 Clean-Out 3 Mech Gripper Plug Ideal for use in hub fittings and in bell-end pipe. Pressure rated for conducting DWV tests. Yellow color enhances visibility in pipe. Made with glass-reinforced ABS plastic and natural rubber O-ring. Patented threaded O-ring ensures airtight seal. Stainless steel hardware prevents corrosion. Guaranteed to seal all damaged threads. Made with glass-reinforced ABS plastic and natural rubber O-ring. Size 3 in Made with glass-reinforced ABS plastic Black color blends well with cast-iron pipe Stainless steel hardware NPT sizes (2, 3, 3.5, 4) Natural rubber threaded o-ring for positive seal