Low Pressure threaded Check Valve covers allow quick on|off access while keeping the heat in and the cold out.  Our Check valves are engineered for the following diameters: 1", 2", 3", and 4" lines.  PipeGlove’s Check Valves are sized to overlap the nipples on lines coming in on each side. Simply cover the check valve from the top down, attach hook and loop at the under side.  Our wraps are engineered to also cover heat trace and fit snug.