Hydro-Gear filter bases accept 3/4-16 UNF, 3" diameter spin-on filter elements, making them easy to mount, while the inlet and outlet flow markings make them easy to use. These filter bases are optimized for low pressure drop when used with Hydro-Gear filters.

9/16-18 UNF 2B straight thread inlet and outlet ports (SAE-6)

1/4-20 UNC 2B threaded bosses (2 places) for mounting