Connects 4 in Corrugated Pipe EXTRA HEAVY DUTY - This HDPE coupler is made from dual wall pipe and has 8 spring-loaded barbs that snap to the corrugated drainage pipe. Our coupler stands out from other pipe fittings and couplers due to its heavy side wall, which is the heaviest in the industry. MOLD INJECTED - Unlike blow molded parts, our coupler is mold-injected, allowing us to have complete control over the wall thickness, ensuring consistency throughout the part. 100% HDPE - This corrugated pipe connector is made from the strongest material on the planet, HDPE with NO blown in fillers and NO recycled material. WILL NOT CRACK - Not only is HDPE durable, it’s also bendable and flexible for underground downspouts where shifting and settling occurs. EASY INSTALLATION - No glue or plumbing tape is required. Simply connect one end of the coupler to the corrugated pipe, attach the second piece of corrugated pipe to the other end. 100% GUARANTEED FOR LIFE - Our HDPE coupler has a lifespan of up to 500 years. We're so confident that our fitting will not crack or break that we are offering a lifetime money back guarantee. MADE IN THE USA , BUILT BY CONTRACTORS - As drainage contractors with over 35 years of experience, we constantly see what’s missing in our industry. Most of our products start with with the simple thought of, “there has to be a better way”. Now we are sharing our knowledge with homeowners and other contractors. The point where you connect two drainage pipes is the typically the weakest part of any system. We now have an extra heavy duty external coupler that makes the connection the strongest part of the drain system. Our external snap coupler has eight spring-loaded barbs that grab the corrugated pipe. This is dual wall drainage pipe. Corrugated on the outside and smooth on the inside. This is guaranteed to never crack or break. It will withstand the freeze and thaw in the north and it'll take ground shifting and sinkholes in the South. This the strongest external coupler on the market and we offer a lifetime guarantee against breakage.