Haskel Mini Sport Booster

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The MSB-9000 Mini Sport Booster from Haskel is designed for diving applications that demand performance, reliability and safety at an affordable price. The oil-free Mini Sport Booster is a compressed air driven, air cooled, non-lubricated, reciprocating piston, single stage type

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Booster prices do NOT include international shipping, or shipping to Alaska, Hawaii, APO/FPO, or U.S. Territories.

Haskel Mini Sport Booster

Haskel Mini Sport Booster
Haskel Mini Sport Booster Top View Cleaned for 100 % Oxygen Service Lubrication Instructions on Side Inlet Port Side View Haskel
  • Portable, reliable and affordable - weight 12 lbs
  • Factory cleaned by Haskel for 100% Oxygen Service
  • Fill up to 3300 psi - boost with pressures of 100 psi
  • Locking Speed Control Sound Muffler
  • Total Separation of Supply Gas and Drive Gas

The approximate size ratio of the { 4 in | 10.1 cm } air drive piston to the gas piston is 25:1. Nitrox Ready, the MSB-9000 Mini Sport Booster is factory cleaned by Haskel for 100% Oxygen Service. As delivered, you can use it to boost pure oxygen, but it can also boost pure helium (plus other inert gases like argon & nitrogen), pure air, as well as nitrox and trimix mixtures of those gases. (Note that depending on the physical properties of the gas being boosted, efficiency and fill times can vary considerably from those of pure oxygen.) The boosters from Dive Gear Express are also factory fresh production, in-stock and immediately shipped directly to you from our warehouse.

The very small size { 14 in L x 6 in W x 6.5 in H | 35.6 cm W x 15.2 cm H x 16.5 cm D } and weight { 12 lb | 5.4 kg } allow it to be conveniently transported. The Mini Sport Booster can fill cylinders up to 3300 psi and it can boost with source gas pressures as low as 100 psi. Popular with technical and rebreather divers, the Mini Sport Booster allows deco & inflation bottles, oxygen and diluent rebreather cylinders to be filled when low pressure compressed air is the only source of power available. Operating with a drive air pressure of just 140 psi means it can be supplied by the LP port of a typical SCUBA first stage regulator and tank.


Take a look at the fill times in the table below. For example, starting with a supply pressure of just 1000 psi, to fill an AL-19 cylinder to 3000 psi takes just 3 minutes. The Haskel Mini Sport Booster is reliable too, with a one year factory warranty. The Haskel name in boosters has long been recognized for their quality.

  • Low Weight Portability
  • Locking Speed Control Sound Muffler
  • Relief Valve for Integrated Air Drive Protection
  • Integrated Cooling Jacket for Extended Seal Life
  • Total Separation of Supply Gas and Drive Gas
  • Cleaned for Oxygen Service

For maximum flexibility, the Haskel Mini Sport Booster is offered in a "naked" configuration, less fittings and hose assemblies. For our model number MSB-9000, the inlet and outlet gas ports accept standard SAE/UNF 9/16"-18 fittings and the drive gas inlet accepts a standard NPT 1/2"-14 fitting. Dive Gear Express offers optional fitting and hose kits, with our DGX Gears Deluxe Fitting and Hose Kit being our most popular complete solution.

Your Haskel Mini Sport Booster also ships with a factory hardcopy documentation package: Operating and Maintenance Manual including illustrated parts breakdown, Oxygen Usage - Best Practice Guide, test procedures, and a Certificate of Cleaning for oxygen service.

Fill Time Examples Boost Time after Equalization to 19 Cu Ft Tank (Min:Sec)

Supply Pressure Target Fill Pressure
2400 psi 3000 psi
500 psi 4:31 6:00
1000 psi 1:44 3:00
1500 psi 0:33 1:31
2000 psi 0:12 1:00
2400 psi 0:00 0:32
More Information
Brand Haskel
SKU HK-9000
Weight 18.000000

Customer Reviews

5 out of 5 stars
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100% of customers
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Verified Buyer
Worth every penny
Apr 6, 2020
Bought this for transfilling/boosting Oxygen pressure in rebreather tanks when on extended trips and/or shop fills unavailable. Excellent product, very well made booster and DGX's well-thought-out line kit with fittings made set-up a breeze. Threw this entire rig in a Pelican case and it's protected and ultra-portable (under 25 lbs). I drive this off of a low pressure inflator hose and it'll fill/boost a 3L tank to 3200 psi in just a few minutes (depending on O2 source pressure). I wanted to take off a star for the high price but I just can't do it on such a well-made product and excellent DGX service! It's worth every penny. Comment by DGX: Please be advised that the Pelican case shown in the pictures supplied by the reviewer is an aftermarket enhancement added by the reviewer and NOT included with the booster.
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Response from Admin
Jun 29, 2022
Please be advised that the Pelican case shown in the reviewers picture is an enhancement added by the reviewer and NOT included with the booster.
Verified Buyer
Nov 26, 2016
Was this review helpful? 3
Tek Tip Warning Image WARNING

Oxygen-related fires and explosions can result in serious injury or death. According to Haskel, this product is compatible with oxygen and factory cleaned for use with oxygen. Nonetheless, the 'clean state' of this equipment applies only prior to initial use. Thereafter, periodic inspection and cleaning are a necessity.

Best practice when boosting oxygen is to keep a low ratio between the source/target pressures and reduce the cycle speed as the ratio increases because rapid compression of oxygen also increases the risk of adiabatic combustion. It may be tempting to pull the maximum amount of gas out of the supply cylinder, but boosting low pressures can very quickly reach high boost ratios. For example, boosting from a {500 psi | 35 bar} source to a target of {2640 psi | 180 bar} is a relatively low boost ratio of about 5:1. However, a source of {300 psi | 20 bar} almost doubles the ratio to about 9:1 and an only slightly lower source of {150 psi | 10 Bar} doubles again to an 18:1 ratio.

You must meticulously follow the recommendations of the US Department of Transportation (DOT), Compressed Gas Association (CGA), and other federal/state/local agencies, plus your training agency for equipment maintenance, handling, storage, labeling, filling, transport and use of compressed gases. Ultimately, you must make the final decision to assume all risks associated with the use of any compressed gases.

Drive Gas Options for the Haskel Mini Sport Booster

The Haskel Mini Sport Booster MSB-9000 is normally driven with the BC inflator hose off the first stage of any diving regulator using a SCUBA tank for the source of a clean and low moisture drive gas. That allows the booster to be highly portable, operating in locations where no electrical outlet is available. Rather than a SCUBA tank, it can be more convenient and cost effective to drive the booster from a portable reciprocating single-stage piston oil-free low-pressure 'shop air' compressor powered by ordinary household electrical current, as long as the air is properly dried and filtered prior to use as a drive gas.

For a drive gas compressor, the air volume rating (typically in cubic-feet-per-minute or CFM) will determine the maximum booster cycle speed and the air pressure rating (typically pounds-per-square-inch or PSI) will determine the maximum boost pressure. In a pinch, almost any air compressor that can deliver at least 1.5 CFM will work although the booster will be quite slow and may not be able to achieve maximum boost pressure. The 3 to 6 CFM range air compressors are adequate for most boosting applications although the boost may pause occasionally while the compressor catches up and the boost cycle time will be noticeably slower approaching higher boost pressures (not necessarily a bad thing). The 7 to 10 CFM range shop air compressors with a large reservoir tank capable of maintaining a constant regulated 140 PSI will produce the best results for boosting. Haskel recommends not exceeding 150 PSI at any time.

Depending on ambient air conditions, the need to manually empty the compressor condensate during operation can be frequent so consider including an auto-drain feature. The design of the MSB-9000 is such that the drive gas section is completely separated from the boost gas section, however we strongly recommend additional moisture and particle filtration on the compressed air. If the drive gas contains moisture then it can cause corrosion to the piston rod and cylinder body, permanently damaging the booster. With the higher volume compressors, add a variable flow control valve in the air line close to the booster itself in order to manage the cycle speed of the booster. Haskel recommends not exceeding 60 cycles per minute continuously, but slower is better especially when boosting oxygen. The MSB-9000 drive gas input fitting is 1/2" NPT female, but the typical shop air line fitting is 1/4" NPT, so an adapter will be needed plus a high-flow quick-connect coupler compatible with the air line from the compressor.

There are a lot of sources for these kinds of compressors and accessories; home or hardware stores as well as specialty suppliers and of course on-line. We find the prices can vary considerably so it pays to shop around for the best value but you should be able to find something suitable for a few hundred dollars.