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 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 AirTAC GFR300-10 is a 300-size filter regulator that removes water and particulate from compressed air and regulates downstream pressure in a single body. This configuration is built for low-pressure service and carries a 5 um filter element (code W) for finer filtration than the standard 40 um grade. The manual drain lets an operator empty the bowl on a chosen schedule, the embedded square gauge reads outlet pressure in MPa, and the fitted reverse (check) valve helps hold the downstream setting if upstream supply is interrupted. It has a 3/8 in NPT port, handles a maximum inlet pressure of 1.0 MPa (145 psi), and works in a -5 to 70 C (non-freezing) environment. The polycarbonate bowl is standard at this size.
This is a genuine AirTAC part. The GFR series is available in sizes 200, 300, 400 and 600 with port sizes from 1/8 in to 1 in, a choice of differential-pressure, automatic or manual drain, 40 um or 5 um filtration, standard or low-pressure regulation, square or external round gauges with MPa, psi or bar scales, and PT, G or NPT threads. Flow figures for this series are published as curves rather than a single rating, so ask us to confirm sizing and datasheet details for your application before ordering.
| 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 | 0.05 - 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, MPa 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". |
| 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. |
| 1 | Gauge scale: MPa. 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) |
On a CNC cell where workholding clamps are specified to run at reduced supply pressure, this low-pressure filter regulator cleans the shop air to 5 um and holds the clamp circuit at the set pressure, with the check valve helping the circuit ride through brief upstream dips.
At a bottling or cartoning line, the 3/8 in NPT connection feeds a manifold of small actuators and air jets; the 5 um element protects the pneumatic components from water and fine debris, and the manual drain is emptied during the scheduled line clean-down.
Inside a machine control panel that drives pilot valves and sensors, this unit filters and regulates the instrument air supply in one body; the square MPa gauge gives the technician a direct read of the set pressure at the panel.
Size 300 with a 3/8 in NPT port suits lines that need more flow than a 1/4 in connection can carry without stepping up to the larger 400 frame - match the size step to the flow your circuit actually needs. The 5 um element (code W) is the right choice when downstream valves, cylinders or instruments are sensitive to finer particles; the standard grade is 40 um. The manual drain (code M) is best where an operator is already on site and you want drain timing under direct control; choose automatic or differential-pressure drain if the unit will run unattended. The square gauge reads in MPa; psi and bar scales and an external round gauge are orderable options. NPT is the thread here, with PT and G available as order options, and this unit ships without a mounting bracket (code J).
Flow for this series is published as curves, not a single rated figure, so send us your application details and we will confirm sizing against the datasheet before you order.
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 rather than a single rated figure, so we do not quote a rated flow number. Send us your application details - required downstream flow, supply pressure and set pressure - and we will confirm the sizing against the datasheet before you order.
The M in the code selects a manual drain: an operator opens it to empty collected water, which suits stations that are visited on a regular maintenance round. The W code selects the 5 um filter element instead of the standard 40 um grade, giving finer particulate removal for sensitive downstream components. If the unit will run unattended, ask us about the automatic or differential-pressure drain versions.
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.