The AirTAC GFR300-10 AirTAC Filter Regulator PT3/8 Low-Pressure is a genuine G-series filter regulator: water separation, 40 µm particulate filtration and balanced-type pressure regulation combined in a single body. It has PT3/8" ports, a differential-pressure drain and regulates 0.15 - 0.9 MPa (20 - 130 psi). It does not lubricate — add a GL lubricator, or order the GFC two-unit set, if downstream equipment needs oil.
The AirTAC GFR300-10 is a 300-size filter regulator that removes water and particulate from compressed air and regulates downstream pressure in a single body. This configuration is the low-pressure type, fitted with an external round gauge scaled in psi, a 40 um standard filter element, and a differential-pressure drain that bleeds accumulated condensate automatically as the pressure differential across the bowl changes. The 3/8 in PT port suits mid-size branch lines feeding valves, cylinders and air tools, and the unit includes a mounting bracket.
This is a genuine AirTAC part from the GFR series, available in sizes 200, 300, 400 and 600 with port options from 1/8 in to 1 in and PT, G (BSPP) or NPT threads. Filter grade can be specified at 40 um standard or 5 um (code W), with automatic, manual or differential-pressure drain choices. Flow is published as curves rather than a single rated figure, so we confirm the datasheet figures for your application on request.
| Model | GFR300-10 AirTAC Filter Regulator PT3/8 Low-Pressure |
|---|---|
| Series | GFR300 filter regulator |
| Port size | PT3/8" (PT thread) |
| Filtering grade | 40 µm |
| Regulating range | 0.15 - 0.9 MPa (20 - 130 psi) |
| Pressure type | Low-pressure type |
| Adjusting mechanism | Balanced type |
| Fluid | Compressed air |
|---|---|
| Max. working pressure | 1.0 MPa (145 psi) |
| Temperature range | -5 to +70 °C (unfreeze) |
| Drain type | Differential-pressure drain |
| Bowl material | PC |
| Pressure gauge | Fitted — round, psi scale |
| Reflux valve | Not fitted |
Specifications follow the official AirTAC G-series air-preparation data. The regulating band is set by the drain type: automatic and differential-pressure drains regulate 0.15 - 0.9 MPa, a manual drain regulates 0.05 - 0.9 MPa. The low-pressure type adjusts over a lower band than standard; we confirm the exact figures from the factory datasheet. Air must not freeze in the unit. Flow curves, weight and outline dimensions are not published in our data set — ask us and we will confirm from the factory datasheet.
| GFR300 | G-series filter regulator, 300 body — sets the port range. |
|---|---|
| 10 | Port size PT3/8". This body offers 08 = PT1/4", 10 = PT3/8", 15 = PT1/2". |
| (blank) | Drain: Differential-pressure drain — this also sets the regulating band (0.15 - 0.9 MPa (20 - 130 psi)). |
| L | Low-pressure type. Blank is standard, L is the low-pressure type. |
| (blank) | Mounting bracket included. |
| (blank) | Pressure gauge fitted (blank). |
| C | Gauge shape: Round. C is round, F is square. |
| 2 | Gauge scale: psi. 1 is MPa, 2 is psi, 3 is bar. |
| (blank) | Filtering grade 40 µm. Only 40 µm (blank) and 5 µm (W) exist. |
| (blank) | PT thread. PT is the default; G is BSPP and T is NPT. |
| (blank) | No reverse-flow valve (the default). |
Field order is size, port, drain, type, bracket, gauge, shape, scale, grade, thread, reflux — a blank position takes the default. Example: GFR300-08 is a 300 body, PT1/4", differential drain, standard type, bracket included, gauge fitted, 40 µm, PT thread, no reflux valve.
A larger body carries a larger port and holds set pressure better as flow rises. AirTAC publishes flow only as curves, so size the body from your peak demand with headroom. The GFR600 uses an aluminium-alloy bowl; the 200, 300 and 400 bodies use PC.
| This model | GFR300 · PT3/8" · 40 µm |
|---|---|
| One size down | GFR200 |
| One size up | GFR400 |
| Add lubrication | GFC300-10 (two-unit set) |
Feeding a clamping cylinder on a machining fixture: the 40 um element keeps welding dust and pipe scale out of the valve, the low-pressure regulator holds a gentle clamp force, and the psi round gauge lets the setter read set pressure directly.
Mounted at the drop to a carton-sealing conveyor's actuator circuit: the differential-pressure drain handles condensate from a long supply run without daily blowdown, and the 3/8 in port matches the branch line serving the sealer head.
Prep point for loom and winding machine air: the low-pressure type suits processes that run at gentle set pressures, the filter bowl catches fibre and compressor carryover, and the bracket gives a clean panel mount beside the machine.
Start with the port step: the 300 size on this model carries a 3/8 in PT port, and stepping up to 400 or 600 gives larger ports and more flow capacity, while 200 suits smaller lines. Choose the filter grade for the job: 40 um standard for general plant air, 5 um (code W) where downstream valves or instruments need finer protection. Drain type is a real choice: differential-pressure (this model) needs no operator attention, automatic drains continuously, and manual suits infrequent condensate loads. Gauge options are the embedded square gauge or an external round gauge in MPa, psi or bar scales - this unit carries a round psi gauge. Thread is PT as standard, with G (BSPP) and NPT as order options, and a mounting bracket is included.
Flow for this series is published as curves, not a single rating, so ask us to confirm sizing against your application before ordering.
Quick checklist
The PC bowl must not be cleaned with solvents — wipe it with a dry cloth. Without the K option, air cannot flow back through the unit. A filter regulator adds no oil to the line.
AirTAC publishes flow for the GFR series as curves rather than a single rated figure, so we do not quote a number. Tell us your application and we will confirm the flow and datasheet figures for this 3/8 in, 300-size unit on request before you order.
The L in GFR30010LC2 marks the low-pressure regulator type, intended for applications set below the standard unit's range. The exact adjustment range for the low-pressure type is not published in our sheet, so confirm your set pressure with us and we will verify suitability. The psi round gauge on this unit makes set-point reading straightforward.
Genuine AirTAC parts produced by AirTAC factory.
Covers non-human-caused product damage.
Standard models usually ship in 3-4 days.
Most inquiries answered within 7-8 hours.
Send us the quantity, thread type (PT / G / NPT), gauge scale and destination. We confirm price, availability and lead time — usually within 7-8 hours.