LASCO 05-2099 ABS Plastic Plumbing Vent with 1 1/2-Inch Male Pipe Thread Mechanical vent installs on the drain line and vents the line without allowing sewer gas to enter the home For venting sinks, tubs, Showers, washing machines, etc. Plastic ABS construction Eliminates the need for secondary stacks 1 1/2-Inch male pipe threads