I ended up getting some small silicone tubing from amazon and went from that to a piece of 1/4" poly to my 3/16 line, then put a bit of heat shrink tube over each joint. Need to get a check valve though so it doesn't push liquid to it when things freeze up. My solution was just to run it at the end of a 30' coil of tub I had kicking around, and it's lasted 2 seasons now.
@ja2wiles, did you ever get the LoRa working? I'm looking at a couple of different options and trying to decide if I want the packetized or LoRA version at 900 or 433MHz. I'm only about 1200' from my base station, and it's straight shot through the woods. I intended to do that but never got to it. My project this year was a temp sensor for my sap storage and a time of flight distance sensor to measure sap height in my tank. Both worked awesome. Surprised how long the sap stayed cool and managed to only over flow my sap storage 1 time!
circa 1990 - tapped with my father, buckets on trees, boiled on the stove.
2019 - 10 taps, boiled in the house, Syrup in ounces.
2020 - 40 taps on bags, added 1 membrane RO, moved outside, 1 gal.
2021 - 60 taps on bags, 50 on 3/16, 2 memb RO, 3 steam pans w/ a block arch, ~5 gal
2022 - 78 taps, all 3/16 on shurflo, 3 memb RO, 5 pans, ~5 gal
2023 - 90 taps, vac, 5 memb RO, 5 pans, ~15 gal
2024 - Same as last year, rebuilt arch in new location, everything on pump, 11.5 gal.