OutdoorMaster Shark II
The pump that publishes both of its flow rates, which is why the arithmetic on this site is possible at all.
By Scooter M. · Published September 2, 2026 · Last updated September 2, 2026
- Two-stage: 350 L/min to fill the shape, then 70 L/min to pressurize.
- 20 psi ceiling, which covers every board in this registry.
- 3.6 lb, running off a 12 V car socket.
- About 5.2 minutes for a 300 L board at 15 psi, computed from its own published rates.
Most electric pumps publish one headline flow rate. OutdoorMaster publishes both stages -- 350 L/min for the high-volume phase and 70 L/min for the high-pressure phase -- and that second number is the one that actually determines how long you wait.
It is also what makes an honest inflation estimate possible, which is why this pump underpins most of the arithmetic on this site.
Why the two rates differ so much
Stage one is essentially a fan: high volume, almost no pressure, filling the board into shape. Stage two is a piston: much lower volume, capable of pushing against 20 psi of back pressure.
A single averaged number would be badly wrong at both ends. Publishing both is a small piece of honesty that most of this category does not bother with.
What that means in minutes
For a 300 L board at 15 psi: 300 liters to fill the shape at 350 L/min is 0.86 minutes, then 306 liters of compression at 70 L/min is 4.37 minutes. Total about 5.2 minutes.
The interesting part of that breakdown is the proportion. Eighty-four percent of the time is stage two. A pump advertised on its 350 L/min headline is being described by the 16 percent of the job that goes quickly.
It is also why the single-stage Bravo BP12 at a constant 160 L/min is faster overall despite being less than half the speed at the start.
The cord is the limitation
Twelve-volt DC through a car socket, with a nine-foot power cord and a 4.5-foot hose. That is a pump for a car park, and it is useless the moment you walk away from the vehicle.
If you always launch within reach of a car it is strictly better than the battery version: no charge to manage, no per-charge limit, and it will do board after board all day. If you ever do not, the Cachalot 2S is the same pump with a battery.
Who should skip it
Anybody who walks to the water, and anybody flying with a board -- 3.6 lb of an airline allowance for a pump that needs a car you do not have is a poor trade.
OutdoorMaster Shark II: the published specification
Everything OutdoorMaster publishes for this model, read on September 2, 2026. Rows marked "Not published" are gaps in the manufacturer's own specification -- we do not fill them with estimates.
| Weight (hull or board) | 3.6 lb |
|---|---|
| Weight (full system) | Not published |
| Packed size | Not published |
| Packed linear inches | Not published |
| Inflated | Not published |
| Capacity | Not published |
| Working pressure | 20 psi |
| Floor pressure | Not published |
| Volume | Not published |
| Material | Not published |
| Chambers | Not published |
| Valves | Not published |
| Warranty | Not published |
#ad We earn a commission if you buy through this link, at no extra cost to you. It never changes the ranking. How this site is funded. Prices checked September 2, 2026.
Questions people actually ask
How long does the OutdoorMaster Shark II take to inflate a paddle board?
Does the Shark II work on an inflatable kayak?
Can you run the Shark II off a portable power bank?
Everyone in this category says they tested twenty boats. We have not tested any, and we say so. What we did instead: pulled the published specifications and the owner's manuals, computed the pump load and the packed volume for every model that publishes enough to compute them, checked the packed sizes against the airline limits you will actually meet, and cited every page we read. The full method.
Sources
Every specification on this page was read from one of these, on the date shown. Specs change between model years, so the date matters as much as the link.
- OutdoorMaster Shark II specifications — read September 2, 2026
- OutdoorMaster Shark 2 listing, Amazon — read September 2, 2026