Profile: FRP Fittings, Inc. mainly offers FRP fittings including couplings, stub flanges, blind flanges, 90 degree elbows, U-vents, and manways in a variety of resins and sizes. We also offer FRP grating in a wide range of materials, grits and colors. FRP grating is manufactured by interweaving continuous wetted fiberglass strands in a mold with thermosetting resin. Typical applications include floor systems, walkways, work platforms, stairs, ramps, trench covers and catwalks.