If you searched for the “Yellow Jacket 93600 5 CFM” vacuum pump, start here: the 93600 is not a 5 CFM pump. The 93600 SKU is Yellow Jacket’s 7 CFM BulletX two-stage rotary vane pump (about 198 L/min, 25 microns or better, US 115V plug). The genuine 5 CFM Yellow Jacket is a different part number — the 93615, rated 142/120 L/min with an EU/UK plug. The “5 CFM” tag gets stuck to the 93600 constantly in listings and searches, but the spec sheet is unambiguous. And here is the part that actually matters for this site: whether it is 7 CFM or 5 CFM, this is a professional HVAC pump, and for degassing epoxy and silicone it is dramatic overkill.
That is the short verdict. The 93600 is a superb, USA-made, daily-duty pump at around $550-$650. It pulls a true 25-micron two-stage vacuum, evacuates a 3-5 gallon resin chamber in under a minute, has an internal check valve to stop oil suckback, and carries a 24-month warranty. None of that is wasted on an HVAC tech. Almost all of it is wasted on a resin bench, because degassing needs far less pump than this — and the comparison table below shows exactly why a $90 single-stage pump produces the same bubble-free pour.
What the 93600 actually is — and the “5 CFM” confusion
A rotary vane vacuum pump spins a rotor with spring-loaded vanes inside an offset cylinder, sweeping air out on each rotation. A single-stage pump does this once. A two-stage pump feeds the exhaust of a first stage into the inlet of a second, which is how it reaches a deeper ultimate vacuum. The 93600 is two-stage, and a good one.
Its headline numbers: 7.0 CFM free-air displacement, an ultimate vacuum of 25 microns or better (roughly 29.9 inHg), a 1/2 HP single-phase motor at 1725 RPM, a 28 oz oil reservoir, and an internal intake check valve. The full spec breakdown sits in the product card above, and the comparison table places it next to the real 5 CFM Yellow Jacket (the 93615), the 6 CFM SuperEvac (93560), a value-class Robinair, and a single-stage hobby pump for scale.
The model-number tangle is worth pinning down because people pay for the wrong thing. The 93600 is the 7 CFM US-plug unit. The 93615 is the 5 CFM EU/UK-plug unit. Both are two-stage, both pull to 25 microns, and for resin the only practical difference between them is evacuation speed — which is already far faster than degassing requires on either pump.
Two-stage 25 microns vs single-stage 75 microns
Here is the core spec difference between this pump and a hobby pump, stripped down:
- A two-stage pump like the 93600 reaches about 25 microns.
- A single-stage hobby pump reaches about 75-150 microns.
On paper that is a 3-6x improvement in depth, and it is the whole reason a pro pump costs more. The catch is what “microns” measures: how close to a perfect vacuum the pump pulls at its own sealed inlet, with nothing attached. The instant you connect it to a real degassing setup — a hose, a fitting or two, a lid gasket, an acrylic chamber — you stop measuring the pump and start measuring the leakiest part of the whole system.
And the leakiest part is never the pump.
Why 25 microns is overkill: the 29.6 inHg threshold
Degassing resin is about pressure differential, not absolute depth. At sea level, atmospheric pressure is about 29.9 inHg. To make dissolved air and stirred-in bubbles expand, rise, and pop, you need to pull a strong vacuum — practically, around 29.6 inHg degasses epoxy and silicone reliably. That is close to full atmospheric vacuum, but it is nowhere near the micron-level deep vacuum a two-stage HVAC pump is built for.
The 93600 reaches roughly 29.9 inHg / 25 microns. It clears the 29.6 inHg degassing threshold with a vast margin. How much deeper the pump can theoretically go below that point does nothing for bubbles, because the bubbles are already gone.
Then there is the real-world ceiling. A typical acrylic-lid vacuum chamber with a rubber gasket and a length of hose leaks down to only about 700-800 microns in practice — it cannot hold deeper because the seal and the acrylic outgas and weep air. That 700-800 micron ceiling sits far above both the 93600’s 25-micron capability and a hobby pump’s 75-micron capability. Your chamber tops out long before either pump runs out of depth. The expensive two-stage advantage gets thrown away at the gasket.
This is the whole argument in one line: pump depth below your chamber’s leak-down ceiling is not usable for degassing. For a fuller treatment, the best vacuum pump for resin guide covers chamber pairing in depth, and pressure pot vs vacuum chamber explains when to skip vacuum degassing entirely.
Degassing performance: where the 7 CFM does help
If 25 microns is wasted on resin, the 7 CFM free-air displacement is the one spec that genuinely improves your experience. CFM is how fast the pump moves air, and it sets how quickly your chamber pulls down. The 93600’s 7 CFM evacuates a 3-5 gallon chamber to working vacuum in well under a minute — noticeably faster than a 3.5 CFM hobby pump’s one-to-two minutes. With fast-cure resin systems that head start matters, because it gets you to full vacuum before the resin starts to kick.
Once you are at vacuum the resin foams up dramatically (the classic “rising soufflé”), then collapses as the bubbles burst. With clear casting resin this finishes within a couple of minutes. With thick mold-making silicone it foams much higher and slower — leave 50-60% headroom in the chamber or it will climb the walls. For reliable single-pull degassing, plan a max pour depth of about 1 inch; deeper than that and the rising foam may not clear before the resin thickens, so use thin layers, a slower-cure resin, or a pressure pot instead. Our best vacuum chamber for resin review pairs chamber sizing to pour volume.
The honest read: the 7 CFM speed is a real, if small, advantage on a resin bench. It is not worth a $450 price premium over a slower pump on its own.
Oil, the check valve, and maintenance
Oil is where any vane pump lives or dies. Use a proper vacuum pump oil (ISO 68 / Yellow Jacket-grade) — never 30W motor oil, which has the wrong viscosity and additives and will not let the pump hold rated vacuum. The 28 oz reservoir has a large sight glass and a large brass drain, so the frequent changes resin work demands are quick. When degassing, the pump pulls solvent vapor and moisture out of the resin and straight into the oil, so it turns milky or cloudy much faster than in HVAC use. Cloudy oil means a degraded vacuum. For frequent resin work, change it roughly every 15-20 running hours, or any time the sight glass looks contaminated.
One thing the 93600 does better than most hobby pumps: it has an internal intake check valve that prevents oil from being pulled back toward the chamber during a power failure or shutdown. On a cheap single-stage pump with no anti-suckback, you have to close the chamber’s ball valve before switching off, every time, or risk oil migrating up the hose. The 93600 builds that protection in. It is a genuinely nice feature for unattended or long degassing runs — and one of the few pro features that translates cleanly to resin use.
93600 vs the alternatives for resin
Set against its real rivals, the picture is consistent. The genuine 5 CFM 93615 and the 6 CFM 93560 SuperEvac are the same story as the 93600 — superb pro pumps, all two-stage, all 15-25 microns, all far more than resin needs. The Robinair 15500 VacuMaster (5 CFM, 20 microns, ~$250-$350) is the value pro pick: it reaches the same degassing threshold for roughly half the price. And a single-stage Kozyvacu TA350 (3.5 CFM, ~$90) still clears the 29.6 inHg threshold and degasses resin perfectly well, just slower and without the check valve.
Every pump in the comparison table produces the same bubble-free pour, because every one of them out-pulls your chamber’s 700-800 micron ceiling. What separates them is build quality, evacuation speed, warranty, and price — and for a resin-only workshop, those favor spending less. The 93600 earns its money on an HVAC truck doing daily system evacuations, where 25 microns and USA-grade durability are the whole point. On a resin bench it is a beautiful tool doing a job a much cheaper pump already finishes.
If you are still choosing your first pump rather than comparing pro units, start with the best vacuum pump for resin buyer’s guide and the broader equipment reviews index, then come back here if you specifically want HVAC-grade build quality.