We have a similar one in design I think.I screwed of the part where you normally connect the compressor and put the bike valve through it. Because the valve has this rubber piece at the end it seals any holes and doesn't move around. If necessary you could always glue it on too.I only got this picture at hand right but I tried to ink it to explain. Red is the part where the compressor should connect and blue is the bike valve.https://imgur.com/a/mK0EbJz

Edit: I just noticed that that pot doesn't have that on the picture. :/ So you would need something like this I guess https://www.amazon.com/dp/B001PLI4BA/ref=redir_mobile_desktop?_encoding=UTF8&psc=1&ref_=ppx_yo_mob_b_inactive_ship_o1_img

I expect this is what you're looking for https://www.amazon.com/dp/B001PLI4BA?ref=ppx_yo2_dt_b_product_details&th=1

Milton (S-684-4) 1/4" MNPT Male Tank Valve https://smile.amazon.com/dp/B001PLI4BA/ref=cm_sw_r_apan_i_6FR0FGR4TEZ655Z70HVH

Think I finally found what I was looking for!