While it fits many standard motors used in these units

The standard Buna-N material is excellent for air

Rugged Construction: Built with a high-grade brass body and NBR seals for reliable air and water compatibility

Failure is typically driven by water hammer

Industry standards recommend replacing these gaskets during every annual boiler inspection or whenever the burner assembly is removed for cleaning

Nidec-US Motors 3256 Motor 320819-301 While it fits many standardThe Nidec US Motors 3256 Motor is a high performance split phase circulating pump motor engineered specifically for hydronic heating and industrial hot water systems. Operating at 1 6 HP and 1725 RPM, this 115Vac single phase motor is the direct replacement for CP R1351 and is compatible with common Bell & Gossett or Armstrong pump assemblies. Built with a NEMA 48Y frame size and a 1 2" shaft with a special circular pump hub, it features ball bearings