The AirTAC GFR300-10 AirTAC Filter Regulator 3/8 in, Low-Pressure, 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 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 filter regulator: it removes water and particulate from compressed air and holds downstream pressure steady in a single body. This unit is the 300 size with a PT3/8 in port, built as the low-pressure (L) type for circuits that run below standard line pressure. It carries the 5 um filter element (code W), a differential-pressure drain on the PC (polycarbonate) bowl, and a round pressure gauge reading in psi. Maximum inlet pressure is 1.0 MPa (145 psi) and the working temperature range is -5 to 70 C, non-freezing. No mounting bracket is fitted.
This is a genuine AirTAC part. The GFR family spans sizes 200, 300, 400 and 600 with ports from 1/8 to 1 in, a choice of differential-pressure, automatic or manual drain, 40 um standard or 5 um filtration, and G (BSPP) or NPT thread options to order. Rated flow is published as curves rather than a single figure, and the low-pressure type's adjustment range is not in the standard tables, so ask us to confirm both against your application.
| Model | GFR300-10 AirTAC Filter Regulator 3/8 in, Low-Pressure, 5 um |
|---|---|
| Series | GFR300 filter regulator |
| Port size | PT3/8" (PT thread) |
| Filtering grade | 5 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. |
| 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. |
| W | Filtering grade 5 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" · 5 µm |
|---|---|
| One size down | GFR200 |
| One size up | GFR400 |
| Add lubrication | GFC300-10 (two-unit set) |
Filtering and regulating supply to pneumatic clamps and hold-downs on a woodworking or machining fixture that runs at reduced line pressure, keeping water and chips out of the clamp cylinders while holding a steady setpoint.
Conditioning compressed air for lab instruments and analytical equipment that need clean, moisture-reduced air at a gentle, stable pressure; the 5 um element protects sensitive downstream components.
Supplying filtered, regulated air to small actuators and grippers on a packaging or bottling conveyor, where stable low pressure keeps pick-and-place motion consistent through the shift.
Pick the size by the flow your line needs: 200, 300, 400 and 600 step up in port and capacity - this unit is 300 with a 3/8 in PT port. Drain options are differential-pressure (fitted here; it bleeds the bowl as pressure drop builds), automatic, or manual. Filtration is 40 um standard; the W code on this unit selects the finer 5 um element for sensitive downstream equipment. Gauges are the embedded square type or an external round gauge in MPa, psi or bar scales - this unit carries a round gauge reading psi. Thread is PT as standard, with G (BSPP) and NPT as order options, and brackets are optional (not fitted here). Flow is published as curves, not a single rating, so send us your demand and we will confirm sizing - and the low-pressure regulation range - before you order.
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 here. Send us your line pressure and air demand and we will confirm the flow from the datasheet on request.
The L code selects the low-pressure variant of the GFR300, intended for circuits that run below standard line pressure. Its exact adjustment range is not published in the standard tables, so ask us to confirm the range for your setpoint before ordering.
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.