Push to Connect fittings are the modern choice for tubing connections. Simply push tubing in; no tools required. Common Application: compressed air, pneumatic instrumentation, circuit, lubricant and cooling lines. Sealing Method: BunaN "O" rings standard. Vacuum: rated at 29.5 Used With: Polyethylene and other plastic tubings. Advantages: ease of assembly, reusability of fittings and the time savings of assembly and disassembly.