This bulk set of 100 push-to-connect air fittings is built for durability and ease of use in industrial and automated applications. Constructed from high-pressure resistant PU and hard plastic, these fittings are built to last and resist deformation. The quick, tool-free installation allows for secure connections with a simple push, and their flexible design enables easy rotation adjustment. The set includes five essential sizes (1/4", 5/32", 5/16", 3/8", and 1/2") with 20 pieces of each, making them ideal for automotive, packaging, electronics, and machinery use. Durable & High-Pressure Resistant - Made from quality PU and hard plastic, these fittings resist deformation, breaking, and trip-outs, ensuring reliable performance and long-lasting use. Quick Push-to-Connect Design - Easy to install and remove without tools. Just push to connect for a secure, leak-resistant fit, saving time and effort. Flexible & Easy to Adjust - Features an elliptical ring design that allows the fittings to rotate freely as needed for flexible hose positioning during use. Wide Industrial Applications - Ideal for automated production equipment across industries including automotive, electronics, packaging, machinery, and more. 5 Sizes in Bulk Pack - Includes 100 pieces (20 each of 1/4", 5/32", 5/16", 3/8", and 1/2" diameters) to fit various tube sizes and fulfill diverse application needs.