Deionization tank head, this is a 2.5" DI tank head. We have in and out heads for most mineral tanks.
This head offers high flow with low restrictions and can be used in a variety of configurations to meet you water filtration needs. They're high quality replacement DI tank heads, if you have any questions about sizing, fittings, accessories, or any other deionization products that you need, call our customer service department 1-888-309-2837, and they'll help you find the products you need.