NEW 37MBR CARAVAN REGULATOR PROPANE GUAGE GAUGE CALOR GAS BOTTLE LEVEL INDICATOR
NEW 37 mbr 21mm REGULATOR GUAGE FOR PROPANE BOTTLES LIKE BELOW. WHEN YOU PUT IT ON A NEW BOTTLE DEPENDING ON SIZE THE NEEDLE GOES ROUGHLY TO THE END OF THE YELLOW AND THEN WILL GRADUALLY GO DOWN WHEN THE BOTTLE IS GETTING EMPTY.