McDonnell & Miller model number 21-12 is a 4-hole gasket that goes between the valve assembly housing and strainer assembly on model number 21 and 221 water feeders.

McDonnell & Miller model number 21-27 is a 4-hole gasket that goes between the valve assembly housing and float housing head on model number 21, 25A, 221, and 27W controls.

McDonnell & Miller model number 847-26 is a head gasket that goes between the flange of the tank and float head assembly on model number 21, 847, 851, and 851S controls.

McDonnell & Miller model number AF1-21 is a gasket that goes between the base switch assembly and duct chamber on model number AF1, AF2, and AF3 air flow switches.

McDonnell & Miller model number AF1-1-21 is a gasket that goes between the base switch assembly and duct chamber on model number AFE-1 air flow switches.