Ensure a tight seal every time with Masterflex fittings. Designed to tight tolerances, these fittings match perfectly to your tubing to ensure smooth flow and a proper fit. Fittings are available in four materials and are available in packs of 10. High-Density Polyethylene (HDPE): Very good chemical resistance. Temp range: -65 to 150°F (-53 to 65°C). Sterilize by ethylene oxide only. Nylon: Good chemical resistance. Temp range: -50 to 250°F (-46 to 121°C). Sterilize by ethylene oxide only.