Hi, Luke. Yes, this is a special SDR 35 pipe requested by Home Depot for use in their landscape drainage bay . . . mostly for use with drain basins. Depot doesn't usually carry an SDR-35 coupler that would fit this particular pipe. 6" schedule 40 couplings won't work. A 6" SDR-35 pvc coupler will work to join two or more of these pieces together. Thanks.