FujiMAC RII Series Air Pump
FujiMAC RII Series Air Pump
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$244.99 USD
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$244.99 USD
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Free shipping over $149 to the lower 48 ($15 flat under). Ships in 1 business day. 30-day returns on unopened items. Free pickup in Miami.
Japanese-made linear diaphragm air pumps, and the quiet workhorse of pond aeration. FujiMAC built these for Japan's Jokasou wastewater market — roughly 40% of an installed base of some 9 million systems — which is a duty cycle no koi pond will ever match. What reaches the pond side is a pump engineered to run continuously for years.
Choosing a size
FujiMAC's chart below is a guide, not a rule. Depth matters more than gallons: the deeper the water, the more pressure the pump has to overcome to push air out of the diffuser at the bottom. In practice, for most ponds around 3 feet deep running a single airstone, a 40R II is usually enough. Deeper ponds need a stronger pump. If you're running several airstones, you don't have to buy one big pump — you can split the load across two or more smaller ones, which also means you're never without air if one goes down. Not sure? Call us at 786-304-2352 with your depth and how many airstones you're running.
| Model | Pond capacity | Max depth |
|---|---|---|
| 40R II | up to 1,000 gal | 47" |
| 60R II | up to 1,500 gal | 61" |
| 80R II | up to 2,000 gal | 78" |
| 100R II | up to 2,500 gal | 97" |
| 120R II | up to 3,000 gal | 116" |
| 200R II | Largest pump FujiMAC sells in North America. Commercial systems, or ganged with other 200R II units. No pond rating published. | |
Manufacturer figures. Treat them as a starting point — a heavily stocked pond, a long air line, or a fine diffuser all change what the pump actually delivers.
Why these instead of a cheaper pump
- Two moving parts. A floating rare earth magnet and two synthetic diaphragms — no pistons, no bearings, no oil, nothing else to wear out
- Rebuildable in about 15 minutes with two common hand tools, rather than replaced
- Genuinely quiet — 37 dB on the smaller units, roughly a whisper in a library
- Low draw — the 40R II runs on 30 watts, less than a games console, and it runs 24/7
- Stable output — FujiMAC states performance does not degrade over time, with smooth airflow rather than uneven pulses
- Resettable circuit breaker built into every model
- Two-year manufacturer's replacement warranty
Specifications
| Model | Air flow | Pressure | Power | Noise | Outlet | Weight |
|---|---|---|---|---|---|---|
| 40R II | 40 L/min (1.4 CFM) | 1.7 PSI (12 kPa) | 30 W | 37 dB | 1/2" (ext 3/4") | 11 lb |
| 60R II | 60 L/min (2.1 CFM) | 2.2 PSI (15 kPa) | 37 W | 37 dB | 1/2" (ext 3/4") | 11 lb |
| 80R II | 80 L/min (2.8 CFM) | 2.2 PSI (15 kPa) | 51 W | 39 dB | 1/2" (ext 3/4") | 11 lb |
| 100R II | 100 L/min (3.5 CFM) | 2.6 PSI (18 kPa) | 74 W | 40 dB | 1/2" (ext 3/4") | 11 lb |
| 120R II | 120 L/min (4.2 CFM) | 2.6 PSI (18 kPa) | 93 W | 41 dB | 3/4" (ext 1") | 11 lb |
| 200R II | 200 L/min (7.1 CFM) | 2.9 PSI (20 kPa) | 155 W | 43 dB | 3/4" (ext 1") | 20 lb |
All models run on 120V / 60 Hz. The 40R II through 120R II share one body; the 200R II is the larger, heavier chassis.
FujiMAC does not publish cabinet dimensions, amperage, diaphragm service life, or an outdoor/weatherproof rating for any model in this series.
