THE HOLDRITE® 117-S Series NO-Hub Fitting Restraints are designed to reinforce no-hub cast iron installations in accordance with the installation instructions of U.S. Cast iron soil pipe manufacturers CISPI designation 310-11 and the 2006 CISPI installation Handbook. When installed correctly, these restraint brackets achieve a safe thrust pressure rating equal to 50 ft head of water pressure for 10 in models and 40 ft for 12 to 15 in. Pipe clamps to be torqued to 60 ft./lb.