The AirTAC GFR300-08-G AirTAC Filter Regulator G1/4 5 um is a genuine G-series filter regulator: water separation, 5 µm particulate filtration and balanced-type pressure regulation combined in a single body. It has PT1/4" 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 GFR300-08-G is a size-300 filter regulator that removes water and particulate from compressed air and regulates downstream pressure in one body. This configuration has a G1/4 (BSPP) port, 5 um filtration, differential-pressure draining of the PC bowl, a standard regulator with a 0.15-0.9 MPa (20-130 psi) adjustment range, and an embedded square gauge scaled in psi. No mounting bracket is fitted and no reverse/check valve is included.
This is a genuine AirTAC part. The GFR family is available in sizes 200, 300, 400 and 600 with a choice of ports, PT/G/NPT threads, 40 um or 5 um filtration, manual, automatic or differential-pressure drains, gauge styles and scales, and bracket options. Flow figures are published as curves rather than a single rating, so ask us to confirm the datasheet for your application.
| Model | GFR300-08-G AirTAC Filter Regulator G1/4 5 um |
|---|---|
| Series | GFR300 filter regulator |
| Port size | PT1/4" (G (BSPP) thread) |
| Filtering grade | 5 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 — square, 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". |
| (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. |
| J | Supplied without bracket. |
| (blank) | Pressure gauge fitted (blank). |
| F | Gauge shape: Square. C is round, F is square. |
| 2 | Gauge scale: psi. 1 is MPa, 2 is psi, 3 is bar. |
| W | Filtering grade 5 µm. Only 40 µm (blank) and 5 µm (W) exist. |
| G | G (BSPP) 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" · 5 µm |
|---|---|
| One size down | GFR200 |
| One size up | GFR400 |
| Add lubrication | GFC300-08 (two-unit set) |
Point-of-use conditioning ahead of a directional-valve manifold on a packaging machine: the 5 um element keeps fine debris out of valve spools while the regulator holds a steady working pressure to the actuator circuit.
Feeding suction-cup grippers and small cylinders on an assembly-cell robot arm, where the G1/4 port matches compact FRL drop lines and the psi-scaled square gauge lets technicians set and verify gripper pressure at the panel.
Conditioning shop-air supply to benchtop lab equipment and analytical instruments that require clean, finely filtered air at a stable, low set pressure within the 0.15-0.9 MPa adjustment range.
Size 300 with a G1/4 port suits lines that need more flow than a size-200 unit without stepping up to size 400; match the size to the flow demand of the downstream circuit. The 5 um element is the finer of the two published grades (40 um is standard) and is the right choice where downstream valves or instruments are sensitive to finer particles. The differential-pressure drain bleeds accumulated condensate automatically as pressure drop across the element rises, with no operator intervention. The square gauge is scaled in psi; MPa and bar scales and an external round gauge are alternatives. G (BSPP) is the thread here; PT is standard and NPT is an order option. Note this unit ships without a mounting bracket. Flow is published as curves, not a single rated figure, 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 this family as curves rather than a single rated figure, so we do not quote one number. Tell us your application and we will confirm the flow data from the datasheet on request before you order.
The W code in GFR30008JF2WG selects the optional 5 um element instead of the 40 um standard grade. The finer element suits downstream valves, cylinders and instruments that are sensitive to finer particles; both grades are available across the GFR range.
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.