Ключевые слова: background, brass, building, concrete, connection, construction, coupler, coupling, coupling box, couplings, cutout, elbow, female, fittings, gas, gate, gate valve, gold, golden, hardware, head, hydraulic, induction, install, installation, jerk, join, maintenance, male, material, metal, muff, nipple, notes, pipe, red, reduction, repair, scale, sleeve, tools, tube, underground tube, union brass, valve, wallpaper, walnut, water, yellow,