Since 1930, ARO has been an industry leader in the design and
manufacture of pneumatic tools and air preparation equipment.

Clean air is a key ingredient that enables the effective and
efficient operation of tools, equipment, and machinery in almost every
industry. Using air preparation devices, such as filters, regulators
and lubricators (FRLs), is an excellent means of keeping your air
supply in top condition, as well as enabling your tools and equipment
to operate at their peak performance.

If you need assistance choosing the right air filter, regulator, and
lubricator combination for your application or have questions
regarding assembly or accessories, contact us today. Our experts are happy to help.

Filter-regulator, or “piggybacks,” combine the functions of both a filter and regulator. Piggybacks are compact and most effective when space is a constraint. Piggybacks can be ordered with different filter elements and can be modified with different springs, depending on the filtration and air regulating requirements.

Another popular combination of filters, regulators, and lubricators is the F/R+L (two-piece combo) arrangement. More configurations may be used depending on your application needs. ARO-Flo combination FRLs are easy to assemble using modular spacer kits.

Filters, regulators, lubricators, and piggybacks can be combined together to form combinations. They are typically strung together in the F+R+L arrangement (three-piece combo) and F/R+L (two-piece combo) arrangement, although other configurations are also used depending on application needs. ARO-Flo combination FRLs are easily assembled using modular spacer kits.

ARO-Flo compressed air filters are designed to remove airborne solid and liquid contaminants. Filters can be ordered with different elements, including coalescing models which are capable of removing oil aerosols and particles down to 0.3 micron. Standard filters are sold with 5-micron elements; 40-micron elements can be purchased and installed separately.

Air line regulators provide controlled consistent air pressure as required for specific pneumatic equipment connected to the air system. All ARO-Flo regulators are offered with a standard adjustment range of 0-140 psig (0-9.6 bar). Alternative spring ranges are offered for easy conversion to suit different requirements. Non-relieving regulators are offered for applications where the venting of downstream overpressure is undesirable.

ARO-Flo mist-type lubricators help ensure that pneumatic devices receive the required lubrication to maintain peak performance, reduce wear, and prolong service life. They are designed to provide the correct amount of oil required for most general applications in a pneumatic system, delivering a constant ratio of oil to airflow. Precise oil feed adjustment sets the proper oil drip rate. Lubricators should be installed close to the downstream application to ensure the effective distribution of oil.

1500 Series Lubricator

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ARO offers a variety of accessories and replacement parts to enable greater customization and flexibility for your application. Lockout valves, check valves, mounting brackets, manifolds, soft start valves, gauges, and pipe adapters are available in several sizes and configurations to fit your needs.


Our ARO-Flo Series of filters, regulators and lubricators and select accessories can now be used in hazardous duty locations requiring ATEX compliance. Learn more.


Providing safe tools and equipment is our top priority. ARO-Flo Series FRLs are designed with integrated safety features such as locking bowls and clear multilingual markings. Accessories such as lockout valves, check valves, and soft-start valves allow the air supply to be safely managed and controlled.


All ARO-Flo accessories are designed to integrate with each other within each size range. From pipe adapters to T-brackets, your complete FRL assembly and its individual components can be easily, safely, and quickly assembled or disassembled with a minimum of tools — no fuss or complications, even with fixed piping.


ARO-Flo Series FRLs set the standard for flow performance. Simply put, air flows better through ARO-Flo filters, regulators, and lubricators than almost any other air filtration device. This means less air is choked during the air preparation process, and your equipment can perform at its peak performance.