Simply cut the tubing to length and push it into the connector. It's that simple! Your plumbing job proceeds almost as fast as you can measure and cut the tubing. Sea Tech products are applicable in many nautical applications including potable water (FDA approved and NSF-61 certified), raw and fresh water washdown, live well systems, air-conditioning chilled water lines, drain lines, and windshield washing systems. A reliable, high quality, cost effective plumbing system Fittings rated to 250psi at 75F and 100psi at 140F; tubing to 160psi at 72F and 100psi at 180F O-ring guide properly aligns O-ring seal and prevents O-ring damage and dislodging during installation Maximized flow rates since fittings connect on the outside of the tubing Fittings can rotate while under pressure without scoring Components can be disconnected and reused without tools by simply pushing in on the (lockable) collet SeaTech female swivel connectors utilize a nut with NPS straight threads and a cone seal; this allows the installer to thread onto NPT, NPS, BSP and most 1/2" male threads without tools Note: Although these fittings are described by their nominal Copper Tubing Size (CTS) by Sea Tech.