4-pieces Chicago air fittings include 3/4 inch barb end couplings with safety locks and washers for immediate pneumatic system setup; Universal 3/4 NPT couplings interchange seamlessly across air compressors, tools, and industrial equipment without adapters Claw-grip hose connectors create instant airtight seals on female ends using spring-loaded retention mechanisms; Self-sealing air connectors embed rubber washers to block leaks automatically at joints under continuous pressure cycles Industrial-grade pneumatic fittings automotive bays, mechanical engineering rigs, and factory air lines reliably; Complete coupling kits deliver spare locks and washers for long-term maintenance across multiple workstations Safety-lock equipped couplings secure connections via lock-hole inserts to prevent accidental disconnections during operation; Two-lug quick-connect fittings install tool-free with a 7/8 diameter lug design for rapid hose swaps in garage or job sites Galvanized carbon steel fittings resist rust in workshops with metal handling moisture and chemical exposure; 150 PSI pneumatic couplings maintain seal integrity at industrial pressure levels for compressors and impact wrenches Please note: There may be slight color differences or variations in the actual product, but this does not affect its use. Please do not mind this. Thank you! Color: As Shown Material: Metal Package Contents: 4 x Chicago air fittings with Rubber Bushing & Locking Pins Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.