Ayuh,..... I put together 1 usin' a 1.5 gallon Chapin steel tank sprayer...
I cut the hose off, at 'bout 1.5', plumbed in a ball valve, 'n a Metal screw-in tip, salvaged from an ole plastic pump-bottle style, from years ago...
Got a piece of clear tubin' 'tween the ball vale, 'n tip,...
'n a 3/8"- 16 screw on cap for it...