Designed for use with Earl's Perform-O-Flex, Auto-Flex, or Ruff-Stuff hose (not recommended for other manufacturer's hose), lightweight Auto-Fit Fittings are easy to assemble and less expensive than Swivel-Seal Fittings. Their nipple is barbed rather than threaded (simply push in during assembly), and hose is compressed between the nipple and socket to seal the barbs.