Do you already own one?

Because if you don't... Get one that comes with a spigot

https://www.amazon.com/gp/aw/d/B07VGPKN26/ref=sspa_mw_detail_0?ie=UTF8&psc=1&pd_rd_i=B07VGPKN26p13NParams&smid=ADN9631RYBGI6&th=1

If you already own one, measure the orifice and head to Lowe's (or other H.I.S.) and see if they have a spigot that is the correct size... I'd bet that you could find one that would allow you to retain the stock collar and gaskets.