Fernco 4"x4" Clay Pipe Flexible Coupling with 2 Stainless Steel Clamps, is used to connect concrete, plastic or cast iron pipes. It is made of tough PVC and has a size of 4 inches. The coupling is flexible and features a 300-series stainless-steel clamp, which is rust- and corrosion-resistant. It also features additional band slots for enhanced flexibility. The Fernco coupling provides a positive seal against infiltration and exfiltration, is leak proof, root proof and resistant to chemicals, ultraviolet rays, fungus growth and normal sewer gases. It connects pipes of the same or different sizes and materials quickly and easily.