412J Parts

OEM-quality replacement parts for the Stokes 412J Microvac rotary piston vacuum pump, including valve disk clappers, valve springs, poppets, gaskets, O-rings, seals, bearings, sight glasses, expansion plugs, solenoid valves, vee belts, and oil mist eliminator filters, plus rebuild kits.

Do you stock OEM parts or aftermarket?

Both. Our catalog includes OEM parts for the pump families we service most heavily, and high-quality aftermarket alternatives where they meet or exceed OEM specifications. On rebuilds, any part replaced is either OEM or an equivalent-spec aftermarket part — we do not use undersized or out-of-tolerance components.

What's the ultimate vacuum of a rebuilt Stokes 412J pump?

A properly rebuilt Stokes 412J Microvac rotary piston pump should reach its OEM-specified ultimate vacuum — typically in the low micron range for a single-stage rotary piston pump. We performance test every rebuild for four hours monitoring vacuum level, temperature, and motor amperage, and we can provide test results on request.

Not sure if you have a 412J or a 412H? See our guide: What's the difference between H-series and J-series Stokes pumps?

For general questions about GLV, see our main FAQ.

Last updated: April 2026

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