THE HOLDRITE® 117-W Series NO-Hub Fittings Restraints are designed to reinforce no-hub cast iron installation in accordance with the installation instructions of U.S. Cast iron soil pipe manufacturers and the 2006 CISPI installation Handbook. The 117-3W thru 117-8W (3 to 8 in Pipe sizes) retain the Wye or Sanitary Tee onto the adjoining piping. All four stainless steel bands must be tightened 60 in/lb minimum. When installed correctly, these restraint brackets achieve a safe thrust pressure rating equal to 50 ft head of water pressure.