From the product description, check product page for current description, price and availability:

This stainless shank includes a stainless 3/16″ hose barb exit, and fits all standard 3″ diameter beer towers. Features a spring hole to hold the optional Intertap Faucet Spring, a stainless spring that works only with Nukatap/Intertap Shanks and Nukatap or Intertap Faucets to add a self closing function.

The shank itself fits all beer faucets, but the self closing function is only possible with Intertap Faucets and the Nukatap Faucet Spring. This does not fit Duotight fittings, it has a hose barb for 3/16″ or 1/4″ beer tubing.