Plumbing fittings, namely, air admittance valves

plumbing and steam fitting supplies, namely plastic plumbing fittings and drain waste and vent fittings, namely couplings, increasers, traps, trap adapters, adapters, unions, fitting and line cleanouts, bushings, elbows, Y and T couplings, flanges, expansion joints, back water valves, test caps and plates, slip caps, joint nuts and washers, grates

plumbing [ and steam fitting ] supplies, namely, plastic plumbing fittings and drain waste and vent fittings, namely, [couplings, increasers], traps,[ trap adapters, adapters, unions, fitting] and line cleanouts[, bushings, elbows, Y and T couplings, flanges, expansion joints, back water valves, test caps and plates, slip caps, joint nuts and washers, grates]