RJS Tech, LLC's reusable "Plug-N-Stub" is the first test plug to seal the open hub of plastic DWV fittings. The nipple-like plug allows through wall and floor penetration during construction. Once removed on finish, connections can be piped out right from the hub. Great for sinks and closet flanges. Patent pending "pinch" ring holds up to 25 psi to prevent blow outs. Available in 1.5", 2" and 3". RJS Tech, LLC.