Airtac GAFR Adjustable Filter Regulator GAFR300N08ALJ
The AirTAC Airtac GAFR Adjustable Filter Regulator GAFR300N08ALJ is a genuine two-in-one filter & regulator — a diversion-type water/particulate filter and a balanced pressure regulator built into ONE body. It has 1/4" ports, a 40 µm filter element and regulates 0.15 - 0.4 MPa (20 - 58 psi). It has no lubricator, so it adds no oil to the airflow.
- TypeFilter & regulator
- Port size1/4"
- Pressure range0.15 - 0.4 MPa (20 - 58 psi)
- Filtering grade40 µm
- Bowl materialNylon
- Drainautomatic
- Pressure gaugeCircular, MPa / psi
- Weight500 g
About the Airtac GAFR Adjustable Filter Regulator GAFR300N08ALJ
The GAFR300N08ALJ is a filter and regulator combined into a single body, so incoming air is first spun to separate liquid water and solid particles, then regulated to a steady outlet pressure. This 1/4in unit has a nylon condensate bowl and a 60 cc drain capacity, weighing 500 g. It operates in the lower pressure band of 0.15-0.4 MPa (20-58 psi) with a 40 um filter element, and the circular gauge shows the set pressure on an MPa/psi scale.
Because the filter and regulator share one housing, this part replaces a separate GAF filter plus a GAR regulator, eliminating two potential leak points and reducing the space needed on the rail. The balanced, self-locking regulator mechanism holds the outlet steady as supply pressure varies, and the pressed-in knob resists drift from vibration. There is no lubricator in this unit; it only filters and regulates.
Airtac GAFR Adjustable Filter Regulator GAFR300N08ALJ Technical Specifications
| Model | Airtac GAFR Adjustable Filter Regulator GAFR300N08ALJ |
|---|---|
| Series | GAFR300 filter & regulator |
| Port size | 1/4" (PT thread) |
| Filtering grade | 40 µm |
| Pressure range | 0.15 - 0.4 MPa (20 - 58 psi) |
| Type | Lower pressure |
| Bowl material | Nylon |
| Drain type | Automatic drain |
| Fluid | Air |
|---|---|
| Max. pressure | 1.0 MPa (145 psi) |
| Proof pressure | 1.5 MPa (215 psi) |
| Temperature range | -5 to +70 °C (unfreeze) |
| Capacity of drain bowl | 60 cc |
| Bracket | Not included (J) |
| Weight | 500 g |
Specifications follow the official AirTAC GAFR catalogue (pages 235-236). Air must not freeze in the unit. The fitted circular gauge reads in MPa / psi, set by the PT thread code. This unit filters and regulates only; it does not add lubrication.
Model Code: Airtac GAFR Adjustable Filter Regulator GAFR300N08ALJ
| GAFR300 | GA300 series filter & regulator — sets the port range, drain-bowl capacity and weight. |
|---|---|
| N | Bowl material: Nylon. Available on this body: PC (blank), Metal (C), Nylon (N). |
| 08 | Port size 1/4". This body offers 08 = 1/4", 10 = 3/8", 15 = 1/2". |
| A | Drain: Automatic drain. |
| L | Lower pressure type — 0.15 - 0.4 MPa (20 - 58 psi). This body offers Standard (S) or Lower pressure (L). |
| J | No bracket (J) — supplied without the mounting bracket. |
| (blank) | Circular pressure gauge fitted. |
| (blank) | Filtering grade 40 µm. |
| (blank) | PT thread; gauge scale MPa / psi. |
| (blank) | No reverse-flow valve. |
The filter and the regulator are ONE body here — there is no separate GAF filter or GAR regulator part to assemble. Need lubrication downstream too? Add a lubricator by ordering the matching GAFC300-08 F.R.L. combination instead.
Size Class & Flow Envelope
- GAFR2001/8"-1/4" · 2000 L/min
- GAFR3001/4"-1/2" · 3500 L/min
- GAFR4003/8"-1/2" · 7000 L/min
- GAFR5003/4" · 8000 L/min
- GAFR6003/4"-1" · 12000 L/min
Figures are the end of the flow curve plotted in the AirTAC catalogue at 0.7 MPa inlet pressure — a sizing envelope for comparing bodies, not a rated flow. Read the catalogue curve for a real duty point. Outlet pressure falls as flow rises, so size a body with headroom above your peak demand.
| This model | GAFR300 · 1/4" · curve to 3500 L/min |
|---|---|
| One size down | GAFR200 |
| One size up | GAFR400 (curve to 7000 L/min) |
| Add a lubricator | GAFC300-08 (F.R.L. combination) |
Where the Airtac GAFR Adjustable Filter Regulator GAFR300N08ALJ Is Used
Precision pressure setting
Set a delicate pneumatic clamp or a light-duty actuator to a precise 0.3 MPa without risk of over-pressurization, thanks to the lower 0.4 MPa ceiling and the balanced regulator that holds the setpoint steady.
Compact machine builds
Fit this single-body filter-regulator into a tight control cabinet where a separate filter and regulator would not fit, reducing the number of joints to seal and simplifying the piping layout.
Unattended wet lines
Use the automatic drain on a line with frequent condensate buildup, so water is expelled automatically without a maintenance visit, keeping the 60 cc nylon bowl from overflowing.
Is the Airtac GAFR Adjustable Filter Regulator GAFR300N08ALJ the Right Air-Prep Unit?
Choose the GAFR300N08ALJ when you need a 1/4in port with a lower pressure ceiling of 0.4 MPa, ideal for sensitive circuits that must never see more than that. The nylon bowl is a build choice for the condensate chamber, while the automatic drain (A) handles water discharge without manual attention, suited for wet or unattended lines. This model ships without the mounting bracket (J), so plan for a panel mount or an existing bracket, and the 40 um element is the standard grade for general shop air. The PT thread means the gauge scale reads MPa/psi, matching common local gauges. If the line downstream needs lubrication, order the matching GAFC300-08 combination instead, which adds a lubricator. With a 1.0 MPa max supply, you have about 0.6 MPa of headroom above the 0.4 MPa top of the regulated range, so the inlet can fluctuate without exceeding the setpoint capability.
Quick checklist
- ✓ Body size for your peak flow (1/4" here)
- ✓ Standard 0.9 MPa or lower-pressure 0.4 MPa
- ✓ Bowl material: PC (blank), Metal (C), Nylon (N)
- ✓ Drain: semi-auto + manual, or automatic
- ✓ Element 40 µm or 5 µm
- ✓ Bracket kept or removed (J); add a lubricator = GAFC
Installation & Maintenance Notes
- check Install with the airflow arrow: IN to OUT, gauge/knob accessible.
- check Keep inlet pressure at or below 1.0 MPa (145 psi).
- check Set pressure with the pressed-in self-locking knob; pull to adjust, press to lock.
- check Drain condensate before the 60 cc bowl fills.
- check Keep the unit above freezing (-5 to +70 °C, unfreeze).
- check Support the 500 g unit on its bracket, not on the tubing.
This is a filter and regulator only — it delivers filtered, pressure-set air with no added oil. If a downstream tool needs lubrication, add a separate lubricator or order the GAFC300-08 combination; do not expect an oil mist from this unit.
Airtac GAFR Adjustable Filter Regulator GAFR300N08ALJ FAQ
The GAFR300N08ALJ is a filter & regulator with a 1/4in port, a nylon bowl, and an automatic drain. Its pressure range is 0.15-0.4 MPa (20-58 psi), with a maximum pressure of 1.0 MPa (145 psi) and proof pressure of 1.5 MPa (215 psi). It operates from -5 to 70 C and must not freeze. The drain bowl capacity is 60 cc, and the unit weighs 500 g. The filter element is 40 um, and the gauge reads MPa/psi.
The 'L' code means this is the lower-pressure type, topping out at 0.4 MPa (58 psi), which is ideal for circuits that must never exceed that level. The 'J' code means the mounting bracket is not included, so you must use a panel mount or an existing bracket. The 'A' code specifies an automatic drain, which discharges condensate without manual intervention, and the 'N' before the port indicates a nylon bowl.
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