The Groz Universal Female Loader Adaptors are designed for grease filler pumps and bulk grease guns. They ensure seamless and leak-proof transfer with their rubber-sealed, threaded 1/4" NPT (F) connections. These versatile adaptors accommodate both 9mm Straight and American Tapered 0.58" (14.7 mm) Bulk Loader Valves, offering a dual-purpose solution for various loading systems. The adaptable top sleeve caters to 9 mm straight loader valves, which can be removed, allowing the base to fit the larger 0.58" (14.7 mm) loader fittings, making it a reliable and adaptable component for your industrial material loading needs