Square Oil Gauge Part# 32178 for Clean Burn burner models CB 500, 525, 525S, 525S2, 550 S/S2, CB 551 H3/H5- also can be used in place of the round gauges used on older Clean Burn burners such as CB 90 HS, CB 85 HS Bullet Point changed to: GAUGE SQUARE 0-15 for Clean Burn CB 500 or CB 500 Series Burners Part# 32178