MULTIPLE THREAD SIZES: Includes 1/8" 1/4" 3/8" 1/2" standard male threads for wide connection compatibility PREMIUM 304 STEEL: Made of 304 stainless steel, rustproof, corrosion-resistant and high temperature resistant HEX DOUBLE MALE: Hexagon design for easy wrench tightening, double male thread for stable connection EXCELLENT SEALING: Precise thread processing, tight fit, no leakage for water and heating systems WIDE APPLICATION: Ideal for water pipes, heating systems, plumbing, air and fluid pipeline connections, Manufacturer: LMLOZZ