Schedule 80 PVC is usually gray in color and has thicker walls; therefore, it can handle higher water pressures. Schedule 80 PVC is well suited for industrial and chemical applications.  By contrast, Schedule 40 PVC is usually white in color and has thinner walls, thus can handle less pressure than Schedule 80. Schedule 80 PVC is usually gray in color and has thicker walls; therefore, it can handle higher water pressures. Schedule 80 PVC is well suited for industrial and chemical applications.
Although schedule 80 PVC is usually gray, sometimes it can be white. Likewise, while schedule 40 PVC is usually white, sometimes it can be gray. Checking the label of the pipe is the only guaranteed way to determine which schedule PVC you have.  The outside diameter is the same for a schedule 80 and a schedule 40 PVC pipe with the same “nominal” size. The difference lies in the thickness of the walls, thus giving the two schedules different interior diameters and different PSI capabilities.
VMS stocks PVC schedule 80 fittings in sizes ranging from 1/2” through 2” and in all available shapes including unions, changes of direction (bends, elbows), branches (tees), bushings, reducers, adapters, couplings, collars etc., allowing for unlimited possibilities of connection.