I just did the conversion on my Weber Q. The propane, QD fittings are 1/4 NPT, and are not available at any Lowes I went to. I bought the Camco hose from Walmart online and the propane QD fittings from a local RV store. CW online also has what is required. Either place sells Camco, which works well when adapting a Weber.
I also bought a hose with the regulator on the bottle end and a QD female on the other end for use at home on a 20# bottle.
Desert185 🇺🇸 (Retired Chemtrail vendor)
-Ram 2500 QC, LB, 4x4, Cummins HO/exhaust brake, 6-speed stick.
-Andersen Ultimate 24K 5er Hitch.
-2014 Cougar 326SRX, Maxxis tires w/TPMS, wet bolts, two 6v batts.
-Four Wheel 8' Popup Camper.