SuperKlean spray nozzles were designed for long lasting durability and to withstand abuse common in industrial environments. Our engineers used simplicity as a key factor in the design of our nozzles. SuperKlean's nozzle is considered one of the few nozzles in the sanitation equipment industry to be truly "user friendly", especially when repairs or replacements have to be made. Model #Description 4-DB Nozzle cover, dark blue 4-G Nozzle cover, gray 4-LB Nozzle cover, light blue 4-W Nozzle cover, white 4-R Nozzle cover, red 4-DDB DuraFlow nozzle cover, dark blue 4-DW DuraFlow nozzle cover, white 4-DR DuraFlow nozzle cover, red 7-DS DuraFlow cartridge or "barrel assembly", 300 series stainless steel, contains all working parts 7-S Cartridge or "barrel assembly", 300 series stainless steel, contains all working parts 7-B Cartridge or "barrel assembly", brass, contains all working parts 6Lock screw or "end adapter", 300 series stainless steel 5-SCage or "thrust collar', 300 series stainless steel 5-BCage or "thrust collar", brass 3Lever bolt, bushing & nut, 300 series stainless steel 2Lever, 300 series stainless steel 1-SNozzle body, 300 series stainless steel, one piece, epoxy resin coated 1-ANozzle body, anodized aluminum, one piece, epoxy resin coated 1-BNozzle body, brass, one piece, epoxy resin coated