and Trap Sizes Guide
Automatic clothes washer — residential - 🧠 ANSWER ✔✔2 DFU; minimum
trap 2 inches.
Automatic clothes washer — commercial - 🧠 ANSWER ✔✔3 DFU;
minimum trap 2 inches.
Bathroom group (1.6 gpf WC) - 🧠 ANSWER ✔✔5 DFU; no separate trap
size specified.
Bathroom group (WC flush >1.6 gpf) - 🧠 ANSWER ✔✔6 DFU; no separate
trap size specified.