Tuf-Tite 6-Hole Distribution Box With Fittings (For 4 inch Pipe) The 6 Hole Distribution Box includes the following 6 - S-35 Seal (yellow) for thin-wall 4 6 - S-40 Seal (blue) for Sch. 40 4 2 - P-10 Plug (orange) for unused holes Injection molded HDPE Distribution box accepts Tuf-Tite's Box Fittings and Speed-Levelers