This might have been discussed before, but just before sanitising a batch of PET bottles this morning using one of those "press down and squirt a jet up into the bottle" gizmo's, I looked around to find the adapter collar I used on the squirting post to fit PET bottles. Without the adapter, the PETs don't sit well on the four little plastic lugs.
Couldn't find it, so rummaged through the fittings box and found a shite and briny SS bit which works a treat! The opening of the PET is a perfect fit over the SS collar, and the collar a perfect fit over the upright squirter:
"Homebrewers are known for their desire to make extreme beers, pushing the limits at every turn..." -- From "Yeast" (Chris White & Jamil Zainasheff)