The AirTAC GFR300C08ALF2 AirTAC Filter Regulator 1/4" PT Auto Drain 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 See datasheet 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 GFR300C08ALF2 is a filter regulator: water and particulate filtration plus pressure regulation combined in one body, so one component conditions the air and sets the working pressure downstream. This size 300 unit is piped 1/4 in PT (the standard thread; G and NPT are order options), carries a 40 um filter element, and has an automatic drain that bleeds collected condensate from the metal bowl without anyone opening it - useful on lines that run unattended. It is the low-pressure regulator type and comes with an embedded square gauge reading in psi, a mounting bracket, and a maximum inlet pressure of 1.0 MPa (145 psi) at -5 to 70 C, non-freezing.
This is a genuine AirTAC part. The GFR family spans sizes 200, 300, 400 and 600 with ports from 1/8 to 1 in, and options include manual or differential-pressure drains, a 5 um element (code W), alternative gauge scales in MPa or bar, and an external round gauge. Flow is published as curves rather than a single rated figure, so ask us and we will confirm the datasheet and sizing figures for this exact model on request.
| Model | GFR300C08ALF2 AirTAC Filter Regulator 1/4" PT Auto Drain |
|---|---|
| Series | GFR300 filter regulator |
| Port size | See datasheet (PT thread) |
| Filtering grade | 40 µm |
| Regulating range | 0.15 - 0.9 MPa (20 - 130 psi) |
| Pressure type | Standard 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 — factory standard, Factory standard 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. Standard type, regulating 0.15 - 0.9 MPa (20 - 130 psi). 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. |
|---|---|
| C0 | Port size See datasheet. 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)). |
| (blank) | Standard type. Blank is standard, L is the low-pressure type. |
| (blank) | Mounting bracket included. |
| (blank) | Pressure gauge fitted (blank). |
| (blank) | Gauge shape: Factory standard. C is round, F is square. |
| (blank) | Gauge scale: Factory standard. 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 · See datasheet · 40 µm |
|---|---|
| One size down | GFR200 |
| One size up | GFR400 |
| Add lubrication | GFC300-C0 (two-unit set) |
Feeding clamping or pressing cylinders on an assembly line that runs at reduced working pressure: the 40 um element stops scale and pipe debris reaching the valve stack, the regulator holds the set pressure, and the automatic drain keeps condensate out of the circuit between shifts.
Supplying instrument air to a test bench or pilot rig where the regulated pressure sits below normal line pressure: the low-pressure regulator type, psi-reading square gauge and 1/4 in PT port make it a compact conditioning stage ahead of sensitive test hardware.
Conditioning air for diverters, pushers and gripper cylinders on a packaging conveyor: filtration and regulation in one body saves a panel joint, the automatic drain handles moisture from long pipe runs, and the included bracket mounts the unit straight onto the machine frame.
Size up by port and flow: this unit is size 300 with a 1/4 in PT port; step to 400 or 600 (up to 1 in) when the line needs more air, or to 200 (1/8 in) for compact points of use. Drain choice matters: automatic (this model) suits unattended duty, manual suits periodic checks, and the default differential-pressure drain bleeds only while flow passes. The 40 um element is standard; specify the W code for the 5 um grade where finer particulate protection is needed. The embedded square gauge is fitted here with a psi scale; MPa or bar scales and an external round gauge are alternatives. Thread is PT as standard, with G (BSPP) and NPT as order options, and the bracket is included.
Two honest routing notes before you order: this is the low-pressure regulator type, and the exact regulated range for it is not published in our data - ask us to confirm it against your set pressure. Flow is published as curves, not a single rating, so send us your application and we will confirm sizing from the datasheet before you commit.
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 there is no one l/min or SCFM number we can honestly quote. Tell us your line pressure, set pressure and the cylinders or tools you are feeding, and we will confirm the sizing from the datasheet for this exact model on request.
The A in the code selects the automatic drain: condensate collected in the metal bowl is expelled without anyone opening it, which suits unattended or high-humidity installations. The alternatives in the GFR family are the default differential-pressure drain, which bleeds only while air flows, and a manual drain for lines checked on a schedule. Filter grade is a separate choice: 40 um is standard on this model, and the W code gives the 5 um grade.
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.