The AirTAC GFR300-08 AirTAC Filter Regulator NPT1/4 5 um Manual Drain 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 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 AirTAC GFR300-08 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 fitted with a 5 um filter element (code W) for finer filtration than the standard 40 um grade, a manual drain for the polycarbonate bowl, a built-in reverse/check valve (code K), and no gauge (code N); a gauge can be ordered as an option. The downstream port is NPT1/4 and the pressure setting is adjusted across 0.05-0.9 MPa (7-130 psi).
This is a genuine AirTAC part from the GFR300 series. The GFR family is available in sizes 200, 300, 400 and 600 with port sizes from 1/8 in to 1 in, in PT (standard), G and NPT threads, with manual, automatic or differential-pressure drains, 40 um or 5 um filtration, gauge options and an optional reverse/check valve. Flow is published as curves rather than a single rated figure, so ask us to confirm datasheet figures for your application on request.
| Model | GFR300-08 AirTAC Filter Regulator NPT1/4 5 um Manual Drain |
|---|---|
| Series | GFR300 filter regulator |
| Port size | PT1/4" (NPT thread) |
| Filtering grade | 5 µm |
| Regulating range | 0.05 - 0.9 MPa (7 - 130 psi) |
| Pressure type | Standard 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 | Not fitted |
| 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. Standard type, regulating 0.05 - 0.9 MPa (7 - 130 psi). 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)). |
| (blank) | Standard type. Blank is standard, L is the low-pressure type. |
| (blank) | Mounting bracket included. |
| N | No pressure gauge (N). |
| (blank) | Gauge shape: Factory standard. C is round, F is square. |
| (blank) | Gauge scale: Factory standard. 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 · PT1/4" · 5 µm |
|---|---|
| One size down | GFR200 |
| One size up | GFR400 |
| Add lubrication | GFC300-08 (two-unit set) |
Positioned ahead of spray guns on a finishing line, the 5 um element strips water and fine particulate that would otherwise blemish paint finishes, while the regulator holds a steady gun supply pressure.
Feeding pick-and-place and clamp cylinders on a packaging conveyor, the unit delivers clean, regulated air so stroke speeds and holding force stay consistent through each shift.
On automated laboratory and analytical equipment, the fine 5 um grade and stable regulated output protect sensitive pneumatic valves and actuators from moisture and debris in the shop air supply.
Size 300 with a 1/4 in port suits lines where the required flow sits between the smaller 200 and larger 400 frames; step up or down a size if your duty demands it. The 5 um element (W) is the right choice when downstream valves, cylinders or instruments need finer protection than the standard 40 um grade; use the manual drain where a controlled, scheduled blow-down fits your maintenance routine. A reverse/check valve is already fitted, and the unit ships with a mounting bracket; no gauge is fitted in this configuration, so add one if you need to read the regulated pressure. NPT is the thread on this code, with PT (standard) and G available as order options. Flow is published as curves, not a single rating, 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. The reflux valve permits reverse flow through the unit. A filter regulator adds no oil to the line.
AirTAC publishes flow for this series as performance curves rather than a single rated figure, so we do not quote a rated flow, Cv or SCFM number. Tell us your application and we will confirm the flow and sizing data from the datasheet on request before you order.
The M in the code specifies a manual drain: the polycarbonate bowl is emptied by hand on a schedule you set, which suits duties where an automatic drain is not wanted. This configuration carries no gauge (code N), so order a gauge option if you need to read the regulated pressure; the reverse/check valve (K) and mounting bracket are included.
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.