Bulkhead fittings connect tubing to a device or another fitting at or through a panel or other barrier. NITRA pneumatic bulkhead female push-to-connect R-Thread fittings have strong thermoplastic (PBT) housings with stainless steel tube gripping claws. Threaded components are nickel-plated brass and have pre-applied Teflon thread sealant (O-ring on M5 threads).