Advanced Drainage Systems, Inc. (ADS) 4 in. Singlewall Internal Coupler is the contractor's choice for connecting two sections of 8 in. singlewall pipe. The coupler snaps inside the ends of each section easily for a secure connection. Made of high density polyethylene (HDPE), the internal coupler is designed to last the life of the drainage system. ADS singlewall fittings are the right choice for your residential and commercial drainage projects.. Application: Non-Potable Water,Potable Water. Color Family: Black. Color/Finish: Black. Compatible Pipe Material: Corrugated. Connection 1: Slip-Joint. Connection 2: Barb. Connectivity: Barb. Features: Underground Rated,Underground Use. Fitting or Connector Type: Coupling. Fitting/ Connector Collection: Sewer & Drain. Material: Polyethylene. Maximum Working Temperature (F): 150. Maximum working pressure (psi): 0. Pack Size: 1. Pipe or Fitting Product Type: Fittings & Connectors. Product Weight (lb.): 0.19 lb. Reducing Fitting: No. Returnable: 90-Day. Double Fitting Size: 4" x 4". Fitting 1 size: 4". Fitting 2 size: 4". Fitting Size Dimensions: 4" x 4". Product Length (in.): 5.75 in. Single Fitting Size: 4". Material: Polyethylene. Fitting or Connector Type: Coupling. Fitting 1 size: 4"