The AirTAC GFR300-10 NPT3/8 AirTAC Filter Regulator, 5 um, Low-Pressure 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 size-300 filter regulator that removes water and particulate from compressed air and regulates downstream pressure in a single body. This configuration is built with a 3/8 in NPT port, a manual drain bowl in polycarbonate, a 5 um filter element (code W) for finer filtration than the standard 40 um grade, the low-pressure regulator type, an embedded square gauge with a bar scale, and a mounting bracket included. Max inlet pressure is 1.0 MPa (145 psi) and the working temperature range is -5 to 70 C (non-freezing).
This is a genuine AirTAC part. The GFR series is available in sizes 200, 300, 400 and 600 with port sizes from 1/8 to 1 inch, a choice of differential-pressure, automatic or manual drains, 40 um or 5 um filter grades, standard or low-pressure regulator types, optional reverse/check valve, and PT, G or NPT threads. Flow is published as curves rather than a single rated figure, so we confirm the datasheet and flow figures for your application on request.
| Model | GFR300-10 NPT3/8 AirTAC Filter Regulator, 5 um, Low-Pressure |
|---|---|
| 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, bar 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". |
| 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. |
| (blank) | Mounting bracket included. |
| (blank) | Pressure gauge fitted (blank). |
| F | Gauge shape: Square. 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. |
| (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) |
Filtered, low-pressure regulated air supplied to a workholding clamp circuit on a machining cell, where the 5 um element protects the clamp valve and the manual drain is emptied during shift checks.
A packaging line's heat-seal or bagging station taking regulated air at reduced pressure from the plant supply, with the filter section catching water and pipe scale before the seal cylinders.
A lab bench drop feeding air-operated apparatus that needs clean, low-pressure air; the 5 um grade and bar-scale gauge let the operator set and read the supply without extra instrumentation.
Size 300 with a 3/8 in NPT port suits lines whose pipework and air demand sit at that step; step up to size 400 or 600 for larger ports and higher flow, or down to size 200 for compact circuits. The 5 um element (code W) is the right choice where finer particulate protection matters; the standard grade is 40 um. The manual drain needs periodic operator attention, unlike the automatic or differential-pressure drain options. The low-pressure regulator type is intended where setpoints sit below the standard type's range; the exact published range for this variant is not stated, so confirm it with us. The square gauge here reads in bar; MPa and psi scales are also available, and an external round gauge is optional. NPT is ordered as the thread option (PT is the catalogue standard; G/BSPP is also available), and the bracket is included.
Flow for this series is published as curves, not a single rated number, 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 the GFR series as curves, not as a single rated figure, so we do not quote a number here. Tell us your application and we will confirm the flow figures from the datasheet on request before you order.
This unit has the M drain code: collected condensate is released by operating the drain by hand, so it needs periodic attention. If you prefer unattended draining, the GFR series is also available with automatic or differential-pressure drains - ask us for those variants.
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.