Inlet Fittings - Concrete Hayward's concrete inlet fittings have 1.5" internal threads for use with directional fittings, plugs, grate inserts, outlet covers and JetAir hydrotherapy fittings. Inlet Fittings - Vinyl & Fiberglass Hayward's Vinyl and Fiberglass inlet fittings have 1.5" internal threads for use with directional fittings, plugs, grate inserts, outlet covers and JetAir hydrotherapy fittings. Directional Flow Inlet Fittings Hayward's directional flow inlet and vac lock safety wall fittings are a perfect match with our concrete, vinyl and fiberglass inlet fittings. Wall/Floor Inlet Fittings Hayward wall and floor inlet fittings for concrete floors are available in a variety of plumbing configurations to suit most applications.

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