• Highlight: Ametek 116551 is a 2-stage 4.8" thru-flow 120V motor with sleeve-bearing (BS) construction, a compact platform Ametek has shipped to vacuum OEMs for decades.
• Best For: Replacement service in residential and light-commercial canister, stick, and central-vac units originally built around a 4.8" thru-flow Ametek motor.
• Expert Note: Thru-flow construction pulls the cooling air through the working airstream — fine for dry pickup, but this 4.8" platform is not specified for wet-recovery service.
