The AirTAC GFR300-08 AirTAC Filter Regulator 1/4 in 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 PT1/4" ports, a manual drain and regulates 0.05 - 0.9 MPa (7 - 130 psi). It does not lubricate — add a GL lubricator, or order the GFC two-unit set, if downstream equipment needs oil.
The GFR300-08 is an AirTAC filter regulator: it removes water and particulate from compressed air and regulates downstream pressure in a single body. This configuration is the 300 size with a PT1/4 port, a 40 um filter element and a manual drain, so the operator empties collected condensate from the bowl by hand. The regulator is the low-pressure type, the unit carries an embedded square gauge scaled in psi, and the K code adds a reverse/check valve that holds the downstream setting if upstream supply drops. No mounting bracket is fitted (code J). Operating temperature is -5 to 70 C (non-freezing) and maximum inlet pressure is 1.0 MPa (145 psi).
This is a genuine AirTAC part. The GFR series spans sizes 200, 300, 400 and 600 with ports from 1/8 to 1 inch, and options include automatic or differential-pressure drains, a 5 um element (code W), external round gauges with MPa, psi or bar scales, and G or NPT threads. Flow is published as curves rather than a single rating, so ask us to confirm the figures from the datasheet for your application.
| Model | GFR300-08 AirTAC Filter Regulator 1/4 in Low-Pressure |
|---|---|
| Series | GFR300 filter regulator |
| Port size | PT1/4" (PT thread) |
| Filtering grade | 40 µm |
| Regulating range | 0.05 - 0.9 MPa (7 - 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 | Manual drain |
| Bowl material | PC |
| Pressure gauge | Fitted — square, psi scale |
| Reflux valve | Fitted (reverse flow permitted) |
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. |
|---|---|
| 08 | Port size PT1/4". This body offers 08 = PT1/4", 10 = PT3/8", 15 = PT1/2". |
| M | Drain: Manual drain — this also sets the regulating band (0.05 - 0.9 MPa (7 - 130 psi)). |
| L | Low-pressure 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. |
| (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. |
| K | Reverse-flow (reflux) valve fitted. |
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) |
Feeds filtered, regulated low-pressure air to the clamp cylinders on a carton-sealing line. The 40 um element keeps condensate and debris out of the clamp valves, and the built-in check valve holds the set pressure if the upstream supply dips mid-cycle.
Mounted at a conveyor junction to supply the stoppers and gating cylinders that index product between lanes. The manual drain lets an operator empty the bowl at shift end, and the psi gauge gives a readable setpoint at the station.
Regulates the supply to air-operated process valves and their pilot circuits on a filling or bottling skid. The low-pressure regulator type suits circuits that run well below full line pressure, while the check valve prevents backfeed through the unit.
Start with the size and port step: GFR comes in 200, 300, 400 and 600, with ports from 1/8 to 1 inch, so step up a size when your air demand outgrows the port. Then pick the drain: differential-pressure (default), automatic (A) for unattended condensate removal, or manual (M) as fitted here. Choose the filter grade - 40 um standard or 5 um with code W - the gauge scale (MPa, psi or bar; this unit is square-gauge psi), the thread (PT is the standard; G and NPT are order options), and whether a bracket is needed (J means none). The L code makes this the low-pressure regulator type; its exact range is not published, so confirm it with us. Because AirTAC publishes flow as curves rather than a single rating, ask us to confirm sizing from the datasheet against your application before ordering.
Quick checklist
The PC bowl must not be cleaned with solvents — wipe it with a dry cloth. The reflux valve permits reverse flow 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 number here. Send us your line pressure and air demand and we will confirm the sizing from the datasheet on request before you order.
The M code means the bowl is emptied by hand, which suits accessible mounting points or intermittent duty; automatic (A) and differential-pressure (default) drains are available in the same series if you prefer unattended drainage. The K code adds a reverse/check valve that holds the downstream pressure if the upstream supply drops.
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.