The AirTAC GFR300-08 AirTAC Filter Regulator, NPT1/4, 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 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 filter regulator: it removes water and particulate from compressed air and regulates downstream pressure in one body. This 300-size unit is fitted with 1/4 in NPT ports, a manual drain for emptying the bowl, a 5 um filter element for finer filtration than the standard 40 um grade, an embedded square gauge scaled in MPa, and a reverse/check valve. Maximum inlet pressure is 1.0 MPa (145 psi) and the operating temperature range is -5 to 70 C (non-freezing). With the manual drain fitted, the regulation range is 0.05-0.9 MPa (7-130 psi).
This is a genuine AirTAC part. The GFR series is available in sizes 200, 300, 400 and 600 with port options from 1/8 to 1 in, a choice of differential-pressure, automatic or manual drain, 40 um or 5 um filtration, PT, G or NPT threads, gauge scale options and an optional reverse/check valve. Flow is published as curves rather than a single rated figure, so we confirm datasheet figures on request.
| Model | GFR300-08 AirTAC Filter Regulator, NPT1/4, 5 um |
|---|---|
| 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 | 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. 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. |
| (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 · PT1/4" · 5 µm |
|---|---|
| One size down | GFR200 |
| One size up | GFR400 |
| Add lubrication | GFC300-08 (two-unit set) |
Filtering and regulating the shop-air feed to a machining centre's pneumatic tool-changer and clamping circuits, where the 5 um element protects fine valves from particulate and the gauge lets setters read supply pressure directly.
Conditioning air for conveyor-mounted pneumatic pushers and diverters on a packaging line, with the regulator set to the actuator's working pressure and the check valve holding the downstream setting if upstream supply dips.
Mounted at a drop leg serving a work cell, the unit filters water and scale out of the header air and regulates pressure for the cell's air tools and cylinders, with the manual drain emptied during scheduled rounds.
Choose the size and port step against the air demand of the circuit: this 300-size unit carries 1/4 in NPT ports, and larger sizes step up to 1/2, 3/4 and 1 in. Because the 5 um element is fitted here, this unit suits points of use that need finer filtration than the standard 40 um grade. The manual drain means an operator drains the bowl periodically rather than relying on an automatic or differential-pressure drain - a practical choice where drains are checked as part of a routine. The square gauge is scaled in MPa; psi and bar scales are available, and an external round gauge is optional. NPT thread is fitted here; PT and G are the other catalogue options. A mounting bracket is included.
Flow for the GFR series 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 the GFR series as curves rather than a single rated figure, so there is no one rated flow number we can quote. Tell us your application and we will confirm the flow and sizing data from the datasheet on request before you order.
This unit is fitted with a manual drain, so the bowl is emptied by hand as part of a routine check rather than automatically. With the manual drain, the regulation range is 0.05-0.9 MPa (7-130 psi); automatic and differential-pressure drain versions are rated 0.15-0.9 MPa (20-130 psi).
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.