Item # 31727 BRAND: Rockwood

Rockwood® 1/2 InchNPT 2 Stage Air Filter Dryer System

Rockwood 1/2” NPT 2 Stage Air Filter Dryer System
Rockwood 1/2” NPT 2 Stage Air Filter Dryer System
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Reg. $223.99 Sale $212.97 Save $11.02
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Rockwood 1/2” NPT 2 Stage Air Filter Dryer System

90 day Warranty Included

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Rockwood® 1/2 InchNPT 2 Stage Air Filter Dryer System

Product Overview:


The Rockwood 1/2” NPT, 2 Stage Air Filter/Dryer System includes a high-capacity, drainable Coalescing Filter and Bowl to trap moisture and other impurities from a compressed air supply. The Dryer section contains a replenishable pellet-type of moisture absorbing desiccant. Also include is an integral mounting bracket for secure mounting.

  • Bowls and housing constructed of aluminum
  • Coalescing filter removes oil vapor, water and dirt
  • Desiccant dryer bowl provides dry air for your system
  • Wall mountable


90 Day


1/2” FNPT Inlet
1/2” FNPT Outlet
Flow Rate 45 CFM
Maximum Pressure 210 PSI
Minimum Pressure 20 PSI
Operating Temperature 41 Degrees F to 140 Degrees F
Filters Down to .01 Microns

In the Box


  • (1) 1/2” FNPT inlet Coalescing Filter with Drain Valve
  • (1) 1/2” FNPT outlet Dryer
  • (2) 2 Bags of Desiccant
  • (1) Integral Mounting Bracket
  • (1) Pressure Gauge

Guides & Accessories


Safety Information

Read Instructions thoroughly read and understand these product instructions before using this equipment. Failure to follow all warnings can result in tool damage or serious physical injury. Keep these product instructions for future reference.



Application Tips



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Questions & Answers

I plan to use 1/2 npt piping for my air compressor lines in my home shop. do I need to use the 1/2 in. npt filter drier assembly or could I get by with the 3/8 in. set up

Asked by: z28station
3/8 would be sufficient enough to use the air dryer in, you will not want to go with anything lower than that.
Answered by: SeanW
Date published: 2019-07-18

If we only use one bag of desiccant, I cannot see it through sight glass. So I put two in it. Will that cause a problem?

Asked by: Scott
The addition bag of desiccant will not cause any issues.
Answered by: Bob G
Date published: 2022-10-28

How much of the desiccant do you put in the Rockwood 1/2" NPT 2 stage filter dryer system. It doesn't really say.

Asked by: Scott
i bag of desiccant fits in this filter at a time.
Answered by: Kelly H
Date published: 2018-10-26

How often does the Desiccant have to be replaced? Is the Desiccant you sell in the quarts and gallons what is needed to replace the Desiccant in the Rockwood 1/2” NPT 2 Stage Air Filter Dryer System Item #31727 that you sell?

Asked by: flyboydale54
The Desiccant sold in quarts is perfect to refill this system. As for how often it needs to be replaced this depends on too many variables to quote a time. The more humid your environment, the more often you use the system, and the volume of air the tool in question uses all play into how fast this desiccant gets consumed.
Answered by: Scott C
Date published: 2020-12-27

Would this unit be suited to keep the air dry for a Central Pneumatic 110 lbs. Pressurized Abrasive Blaster so the sand will not get moisture in it and clog up?

Asked by: flyboydale54
This would work perfect to hook up before going into an abrasive blaster.
Answered by: SeanW
Date published: 2021-05-13

Hi,I want to paint my car probably the only car i will paint what would be a good set up i have a 60 gallon 155psi max compressor and will install filter/dryer etc. about 75' from compressor. Thanks

Asked by: Pete
The shorter the air hose the better you'll be, unless you have a compressor which has a pretty high CFM output. Say your paint gun requires 6 CFM and you have 75 feet of hose. This would mean you would probably want approximately 12+ capable CFM output compressor to make sure you can account for loss in the long air hose.
Answered by: Scott C
Date published: 2022-03-23

Where is this made?

Asked by: Thomas
This unit is manufactured in China to Eastwood's Specifications.
Answered by: Scott C
Date published: 2018-07-19

Is the 1/2" mounting bracket between the bowls that connect them together available for purchase seperatelt to work with the 1/2" rockwood pressure regulator. I see the 3/8" version but not one for 1/2"

Asked by: Jake34
Unfortunately we do not have the connecting block for the 1/2 filter at this time.
Answered by: Scott C
Date published: 2018-07-09
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Rockwood® 1/2 InchNPT 2 Stage Air Filter Dryer System
Reg. $223.99 Sale $212.97 Save $11.02
In Stock