A line of precision orifices from O'Keefe Controls employs straight threads and O-ring nose seals. Features include improved installation and removal, while the nose seal prevents leakage around the straight threads. The body is comprised of brass or stainless steel, and nose seals are viton or buna-N. The line is offered in various thread sizes with an orifice range of .004 to .094 in (0.1 to 2.4 mm). Suitable for metering the flow of liquids or gases, orifices are used in compressed air or vacuum systems as well as water or oil systems, for flow restriction or flow rate control in timing circuits, or as precision reference standards in leak detection systems.