This Motor Start Capacitor is designed for 230V spa pump motors and measures 1-7/16" diameter x 2-3/4" height. If your pump powers up but only hums without starting, this component may need replacement. A quick diagnostic test: manually rotate the motor shaft from the rear using a screwdriver, or activate high-speed mode via your jet button and then return to low speed. If the motor operates on low speed after this test, the capacitor likely requires replacement. Important: A failing capacitor is often an indicator of underlying motor problems rather than the root cause itself. While replacement may restore function temporarily (typically one week to one month), recurring failures suggest deeper motor issues that need attention. Match your replacement by checking the stamped specifications and physical dimensions on your existing unit. Specifications: Capacitor Type: Motor Start | Compatible Motor Brands: A.O.Smith/Regal Beloit, Century/Regal Beloit, Franklin Electric, General Electric | Microfarad Rating: 53-64 mfd | Motor Parts Type: Capacitor, Start | Length: 2-3/4" | Part Dimensions: 1-7/16"dia x 2-3/4"h | Diameter/Width: 1-7/16" | Capacitor Microfarad Rating +/- 10%: 53-64 mfd | Electrical Connection: 1/4" tab | Voltage: 230v