A buddy gave me a liquid post that he found in his junk box, and I was surprised to find that it was 1/8 NPT thread, not a flare. A quick trip to Ho Dep and I had a 1/8 MPT to 1/8 barb fitting to match.
I cut the nozzle off a 1/2 liter wash bottle and drilled the hole out to 1/2 inch, screwed the MIP/Barb fitting through the hole, and tightened the liquid post down on top. About 6 inches of 1/8 inch Tygon tubing for a dip tube finished the job, and it works like a charm.
Sometimes I do a job, and it just works!
Charlie