IPS 83656 2-Inch Mechanical Cleanout Test Plug Clear cap provides a "window" to monitor the test media as it drains Expandable rubber gasket provides air and water tight seal No tools, hoses, or gauges are required for installation Hand tighten in seconds Durable design; Plated Steel parts will not rust Clear cap provides a "window" to monitor the test media as it drains Expandable rubber gasket provides air and water tight seal Durable design; plated steel parts will not rust No tools, hoses, or gauges are required for installation Hand tighten in seconds