The offspring of a pool noodle and a firehose?
Don't buy a medicine spoon STP until you've practiced with a medicine spoon on its own and know if you can use it without dripping. Not everyone's anatomy will allow it, or at least easily; mine won't.
I failed the STP-Fitz, the tubing was too large. Flow wasn't strong enough so I'd splatter and drip. Pulled it out of the packer and was going to make my own nipple attachment when I found some smaller tubing. My mom saw it in my bathroom and asked what it was (just the tubing/nipple). "Fish tank equipment." Seemed legit to her. A few months later, I go to drain a tank with a canister filter on it, and it's a pretty large tank, so it's a pain to hold a siphon in place if I can just drain it with the filter, but the filter intake isn't long enough. Guess what stretches over it to extend it right down to the bottom of the tank, the nipple end letting the water level get lower than the cut end of a hose? "Fish tank equipment", indeed!
I haven't found anything that works for me yet, since I haven't got around to making new guts for the STP-Fitz, if I'm in a men's room, I just use a stall, and sit if it's empty. If it's not...things get very splashy. :-( I'd like to try the Peecock.