The AirTAC GFR300-08 AirTAC Filter Regulator PT1/4, Auto Drain, 40 um 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 PT1/4" ports, a automatic 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 GFR300-08 is a filter regulator: it removes water and particulate from compressed air and regulates downstream pressure in a single body. This 300-size unit is threaded PT1/4 (1/4 in) and carries a 40 um standard filter element with an automatic drain, so collected condensate is expelled without manual attention. The regulator is the standard type with an adjustment range of 0.15-0.9 MPa (20-130 psi), and this configuration is fitted with an external round pressure gauge scaled in psi. The polycarbonate bowl is rated for a maximum inlet pressure of 1.0 MPa (145 psi), and the unit operates in temperatures from -5 to 70 C (non-freezing). No mounting bracket is included and no reverse/check valve is fitted.
This is a genuine AirTAC part. The GFR filter-regulator family spans sizes 200, 300, 400 and 600 with port sizes from 1/8 in to 1 in, and options include manual or differential-pressure drains, a 5 um element (code W), embedded square or external round gauges with MPa, psi or bar scales, G or NPT threads, a bracket, and a reverse/check valve. Flow is published as curves rather than a single rated figure, so ask us to confirm the datasheet and sizing figures for your application on request.
| Model | GFR300-08 AirTAC Filter Regulator PT1/4, Auto Drain, 40 um |
|---|---|
| Series | GFR300 filter regulator |
| Port size | PT1/4" (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 | Automatic 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. 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. |
|---|---|
| 08 | Port size PT1/4". This body offers 08 = PT1/4", 10 = PT3/8", 15 = PT1/2". |
| A | Drain: Automatic 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. |
| J | Supplied without bracket. |
| (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 · PT1/4" · 40 µm |
|---|---|
| One size down | GFR200 |
| One size up | GFR400 |
| Add lubrication | GFC300-08 (two-unit set) |
On a bench or gantry pneumatic press, clean dry air at a set pressure is what the cylinder and valve stack need. The GFR300-08 filters water and swarf from the shop-air drop at 1/4 in, holds the regulator at the pressure the tooling was set up for, and the automatic drain keeps condensate out of the bowl without an operator stopping by.
Packaging and cartoning machines run dozens of small cylinders and air jets off a single 1/4 in branch. A GFR300-08 at the head of that branch removes moisture and particles that stick valves and foul seals, regulates the branch to the pressure the machine builder specified, and the psi gauge gives the line technician a readable setpoint.
In an assembly cell fed from a plant ring main, each workstation needs filtered air at a stable, repeatable pressure for air tools, clamps and pick-and-place actuators. The GFR300-08 conditions the drop at 1/4 in PT, the automatic drain handles condensate during shift running, and the standard 0.15-0.9 MPa adjustment range covers typical cell setpoints.
Choose the size and port step against the air consumption of the circuit: this 300-size unit takes a 1/4 in PT port, and larger sizes step up to 1 in for higher demand. Drain type is a real choice: automatic (this unit) expels condensate by itself, manual drain requires operator action, and the differential-pressure default drains on a pressure differential. Filter grade is 40 um standard or 5 um with code W if finer filtration is needed. Gauge options are the embedded square gauge or an external round gauge, with MPa, psi or bar scales - this unit has a round psi gauge. Thread is PT as standard, with G (BSPP) and NPT available as order options; a bracket is optional (not included here). Flow for this family 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, not as a single rated figure, so we do not quote a flow number for this unit. Tell us your application and air consumption and we will confirm the flow and sizing figures from the datasheet on request before you order.
The A in the code GFR30008AJC2 selects the automatic drain: condensate collected in the polycarbonate bowl is expelled without anyone opening a valve. The family also offers manual drain and a differential-pressure drain as alternatives, so you can match the drain to how the machine is attended.
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.