particularly the "Z" dimension of 1 1/8" (or 1 3/8" with a heat shield)

This model typically features lead wire terminals for secure integration into the existing wiring harness of your Trane or American Standard unit

but proper conversion kits and specific burner orifices must be utilized depending on your fuel source

By choosing this high-efficiency HVAC part

Direct OEM Compatibility: Verified as identical to part 46G4101 and replaces legacy LB-56689CB and 21G71 components

Aurora Pump 476-0250-644 Mechanical Seal Kit 321894-708 particularly the "Z" dimension ofThe Aurora Pump 476 0250 644 Mechanical Seal Kit is a precision engineered pump repair kit designed to restore the hydraulic integrity of your pumping system. Engineered for high performance centrifugal pumps, this mechanical seal replacement ensures a leak free operation, preventing fluid loss and maintaining optimal pressure. Utilizing durable silicon carbide or premium carbon ceramic materials, the seal faces are built to withstand the rigorous