1-7/16" round burner sight glass SG-510

Fireproof replacement furnace burner sight glass measures 1-7/16" in diameter.  This is our small size.  We also sell two other sizes.  Medium size is part # SG-511 and our large size is part # SG-512.

Also available separately for this site small glass is a slip-ring nut (SN-500) and a high-heat gasket (G-180).