Max Dry & Max Dry XXL

Product # 25310-2

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  • $469.95

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Our Max Dry and Max Dry XXL function as the ultimate air dryer/regulator and the perfect workstation dryer for the serious home or body shop. Humidity can wreak havoc on your air tools because, as air cools off down the line in your air hose, the humidity in the air condenses and turns into moisture, which creates headaches for you. The Max Dry and Max Dry XXL eliminate the humidity and moisture problem. See how below.

The Max Dry and Max Dry XXL provide a five-stage filtration process in an all-in-one unit. The first stage consists of a self-draining, 5 micron filter, which filters out, down to 40 microns, all liquid water, liquid oil, dust, dirt, rust, and pipe scale.

The second stage features a coalescing filter, which functions differently than a standard particulate filter. Air flows from inside to outside through a coalescing media. Small aerosols come in contact with the fibers in the media and unite with other aerosols caught in the fibers. The aerosols continue to unite and emerge as a droplet on the outside of the media, and gravity allows the droplet to drain away. The second stage filters, down to .03 microns, all oil mist, water mist, and submicronic particles.

The third stage separates our Max Dry and Max Dry XXL from all of the rest! Air enters the third stage and passes through a 70 micron filter, which evenly disperses the air through either a 2-quart (Max Dry, #25310-2) or a 4-quart (Max Dry XXL, #25310-1G) desiccant bed. The desiccant removes humidity from the air to a temperature of -3° F, which eliminates the possibility of any moisture condensing in your air lines and being pumped through your plasma cutter, sander, air ratchet, grinder, or spray gun. The Max Dry comes setup with 2-quarts of desiccant, and the Max Dry XXL comes with 1-gallon (4-quarts) of desiccant. 

Best of all, you can reuse the desiccant. The desiccant is dark blue in color when dry and ready to absorb moisture, and then turns a clear, orange-like color after absorbing as much water vapor as possible. When the desiccant turns to a clear, orange-like color, simply pour the desiccant into a baking pan, pop the baking pan into the oven at 325° F, and bake for approximately one hour. The desiccant turns back to blue and provides you, once again, with clean, dry air.

Stage four and stage five consist of a final filtration and a precise regulator. The regulator accurately controls the secondary pressure between 2 and 125 psi, the self-bleed venting feature permits use on dead-end applications, and the inlet and outlet is 1/2" NPT female.

The pressure regulator, shut off valve, and mounting bracket are included.

The Max Dry & Max Dry XXL both have overnight drains. This means that when the compressor is turned off and there is no pressure then the unit will drain.  If you do not turn the compressor off or if you have a lot of water build up during the day you might want to consider purchasing the automatic drain part number 25310-5200.

Inlet pressure rated at 250 PSI. Even though the regulator pressure range only adjusts from 5 to 125 PSI, the regulator can handle 250 PSI. Designed to flow 25 SCFM @ 50 PSI; if you run a higher PSI, then the SCFM will go down.

Warrantied for a period of one (1) year, from the original date of purchase, this warranty only covers against defects in material and workmanship.  Replacement filters, elements, repair kits and sight kits are not warrantied items.

Pipe Size Model No. Max Flow SCFM* Max Flow SCF* Desiccant Weight Desiccant Charge
1/2" 25310-2 15 to 25 5000 2-1/2 Lbs. 2 Qt.
1/2" 25310-1G 25 to 50 12500 6 Lbs. 1 Gal.
*SCFM and SCF based on 70ºF inlet temp. @ 100 PSIG

CA Prop 65 - For Residents of California
Warning: Welding and cutting equipment, accessories, and fumes can expose you to chemicals, including Chromium (Hexavalent Compounds), Lead, and Nickel, which are known to the State of California to cause cancer and/or birth defects or other reproductive harm. For more information, please visit
Customer Reviews
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Filter Reviews:
Robert H.
Canada Canada

Air dryer review

Unit works perfectly with my plasma cutter. Unfortunately the unit was broken when it arrived at my house and I opened the package. The regulator and dryer brass connection snapped in half and the regulator knob had a crack on the top. Something obviously hit it hard. I did not feel like sending it back, especially from Canada...I was able to extract the broken threaded brass segment in the dryer connection and get a replacement threaded connector. Other than that a 5 star for performance.

HTP America - USA Weld Max Dry & Max Dry XXL Review
John R.
United States United States

high quality, initial impressions very good

Installed this drier w/ a 5hp 80-gallon compressor with an intercooler a few weeks ago. The drier came very well packed and arrived quickly. The unit is of high quality and the regulator works well. Parts diagrams for each of the components and extra fittings were/will be very helpful. I have the united mounted to the wall with the supplied brackets and it's very sturdy overall. The one thing I would have appreciated was some overall best practices on installation. Ie. should a manual drain valve be installed directly upstream/downstream of the unit itself, should the unit ideally be installed above/below the compressor outlet, etc. I have not had the unit in service long enough to give a good assessment on function.

Henry P.
United States United States

Great Quality

Very impressed with the quality and very happy its made in USA. Kind hard to see in the look glass, I only got one bead in it, not sure if that is normal. But it comes with pressure gauge and some fittings so that was nice. The sale price was great too. I should buy another.

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