1. Construction: Crafted from grade rubber and robust metal, our sewer cleanout cover ensures unmatched expansion and airtight sealing. Featuring stainless steel wing nuts over traditional plastic, the design guarantees increased stability and reliable, extended use. 2.Comprehensive Package: Each includes a fully assembled 3inch sewer cleanout cap, designed to safeguard your plumbing infrastructure. This essential tool prevents pipe breakage by shielding sink pools and pipe entries against debris and external blockages. 3.UserFriendly Design: Engineered for ease of use, our expansion plug facilitates simple installation without the need for additional tools. By tightly sealing drain inlets and lines, it effectively prevents water intrusion and safeguards plumbing systems in residential and commercial settings. 4.Versatile Functionality: Suitable for a broad range of applications, this cap serves not only as a reliable plug for storage units, pools, and sinks but also as an effective tool in pressure testing and plumbing maintenance. It is compatible with most piping systems and can be employed in kitchens, bathrooms, and outdoor pool areas.