Push Connect tube fittings are made of nickel-plated brass and rated to 250 psi. Push Connect Plus has a lower profile for those tight places. A captured Teflon® ring around the base of the hex shoulder, seals similar to a reusable (SAE type) seal eliminates thread sealant and loose particles associated with thread sealant. No tools are required to save time in assembly and disassembly. Typical applications include compressed air, pneumatic instrumentation, circuit lubricant, and cooling lines.