QUICK-ACTING FLUSH SCUTTLES > IAW DWGS: 803-1623054, 803-1623056 AND 803-1623057 > NOTE: 18" AND 21" FLUSH SCUTTLES HAVE 3 DOGS; 25" FLUSH SCUTTLES HAVE 4 DOGS > SPECIFY WHEN ORDERING: CLEAR OPENING DIAMETER (18", 21" OR 25"), AND ANY SPECIAL INSTRUCTIONS > MATERIAL: STEEL (ALTERNATE MATERIALS AVAILABLE) > STANDARD FINISH: INORGANIC ZINC AND FORMULA 150 PRIMER; FLAME (WIRE) SPRAYED ALUMINUM AVAILABLE FOR EXTERIOR SCUTTLES