Features:

• Model No. 20391
• The valve should be connected to the piping in accordance with the manufacturer’s installation instructions
• The valve should be installed in the vertical, upright position after rough-in and pressure testing of the DWV system
• A minimum of one vent shall extend to the open atmosphere for ever building drainage system
• The valve should not be installed as a vent terminal for any special (chemical) waste system or in supply and return air plenums
• For installation in areas with temperature range between -40 and 150 degrees F