This is a connector to make a 1/4" inverted flare pigtail fit a regulator that has a 1/4 female pipe thread.
1/4" inverted flare x 1/4" male pipe thread
New
Propane adapter converts 1/4 inverted flare to 1/4 pipe thread
$2.9
Type
brass
MPN
148-4b
Brand
Gas-Flo
condition
Open box