The AirTAC GFR300-10 AirTAC Filter Regulator, NPT 3/8 in, 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 size-300 filter regulator: it removes water and particulate from compressed air and regulates downstream pressure in one body. This configuration is the low-pressure type, fitted with a 5 um (code W) filter element for finer filtration than the standard 40 um grade, a differential-pressure drain that bleeds condensate automatically as flow passes through, a round pressure gauge reading in bar, and a built-in reverse (check) valve that holds the downstream setting when the upstream supply is lost. The 3/8 in NPT port suits mid-size lines, and the polycarbonate bowl lets you see the condensate level at a glance. Maximum inlet pressure is 1.0 MPa (145 psi); working temperature is -5 to 70 C, non-freezing.
This is a genuine AirTAC part. The GFR family is published in sizes 200, 300, 400 and 600 with port sizes from 1/8 to 1 inch, a choice of drain type, 40 um or 5 um filtration, gauge style and scale, and PT, G or NPT threads. Flow for this series is published as curves rather than a single rated figure, so ask us and we will confirm the datasheet figures for your application before you order.
| Model | GFR300-10 AirTAC Filter Regulator, NPT 3/8 in, 5 um |
|---|---|
| Series | GFR300 filter regulator |
| Port size | PT3/8" (NPT 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, bar 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. |
|---|---|
| 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. |
| 3 | Gauge scale: bar. 1 is MPa, 2 is psi, 3 is bar. |
| W | Filtering grade 5 µm. Only 40 µm (blank) and 5 µm (W) exist. |
| T | NPT 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 · PT3/8" · 5 µm |
|---|---|
| One size down | GFR200 |
| One size up | GFR400 |
| Add lubrication | GFC300-10 (two-unit set) |
Feeding bench-top test rigs and analytical instruments from a shop-air header, where the low-pressure regulator holds a gentle, stable supply and the 5 um element keeps fine particulate out of sensitive components.
Regulating the air to pneumatic clamps on a fabrication cell fixture, with the check valve holding clamp pressure if the main supply dips and the differential-pressure drain keeping condensate off the valve seats.
Supplying positioners and pilot-operated process valves on a plant line, where the low-pressure type matches modest setpoints, the 5 um grade protects small pilot orifices, and the bar-scale round gauge gives operators a local reading.
Size 300 with a 3/8 in NPT port is the mid step of the GFR range; step up to size 400 or 600, or down to 200, as your line's flow demand changes - we will check the published flow curves against your application on request. This unit is the low-pressure type, intended for circuits whose regulated pressure sits below the standard regulator's range; the exact adjustment window for the low-pressure build is not published, so confirm it with us before ordering if your setpoint is critical. The 5 um element (code W) is the finer of the two published grades and suits downstream equipment that tolerates less particulate; the standard grade is 40 um. The differential-pressure drain is the default and needs no operator attention; automatic and manual drains are alternatives in this family. The round gauge here reads in bar; square embedded gauges and MPa or psi scales are the other published options. NPT is the thread on this unit; PT (standard) and G are order options, and brackets are optional - this configuration is supplied without one.
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 number, so we do not quote a figure here. Send us your line pressure, setpoint and expected air demand and we will confirm the datasheet curve and correct size for your application on request.
The L in the code marks the low-pressure regulator build, intended for circuits whose working pressure sits below what the standard type covers. The exact adjustment range for the low-pressure build is not published in the material we hold, so tell us your target setpoint and we will confirm suitability before you order. This unit also carries a reverse (check) valve, so the downstream setting is held if the upstream supply is interrupted.
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.