Adapter fittings are manufactured to be threaded directly into standardized NPT 1/8" mates. The Valved Flow path maintains a controlled disconnect of fluid and gas lines that are under pressure. Polypropylene is a lightweight, general-purpose material that is a sterilizable and medical-grade material. O-rings made of Buna-N offer good resistance to water, basic oils, lubricants, some fuels, and many pneumatic and hydraulic systems. These Non-Magnetic springs are made from non-ferrous metals and are rated MRI conditional. Size 3 fittings are designed to accommodate tubing that measures 3/16" or 4.76mm (ID).