11 Plumbing fittings for waste and overflow installations and installations for sanitary purposes and parts thereof, namely, pipe sockets, slip couplings, couplings, triple sockets, multi-branch sockets, multi-branch access caps, collar-boss branches, boss branches, strap-on bosses, boss connectors, concentric socket [plus] * plug * splash reducers, reducers, eccentric reducers, access caps, access cap and pressure plugs, PVC adaptors, cast iron adaptors, automatic air admittance valves, duct pipes, long radius duct bends, grille connectors, wall grilles, flexible ducts, cowls/vent terminals, vent terminals, weathering collars, barrel clip collars, drive-in spike and back plates, WC seal and retaining caps, flanges, floor outlets, trapped floor gulleys, stainless steel tile grid and cover plates, fire sleeves, vent terminals, vent slate caps, female iron adaptors, male iron adaptors, caulking bushes, caps and linings, multi-fit straight tank connectors, tubular swivel traps, bottle traps, monitor anti-siphon bottle traps, low inlet tubular bath traps, shallow bath traps, low level bath traps, running tubular swivel traps, inlet height adjusters, washing machine tees, universal trap bends, bath overflow outlets, bath overflow manifolds, snap caps, pipe brackets, single support brackets, channel brackets, double support base plates, channel strips, single support base plates, angle cleats, channel strip unions, channel strip angles, barrel slip collars, nuts and bolts for use therewith, systems comprising these parts