The AirTAC GFR300-08 AirTAC Filter Regulator, NPT1/4, 40 um is a genuine G-series filter regulator: water separation, 40 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 300-size filter regulator that removes water and particulate from compressed air and sets downstream pressure in a single body. This configuration has a 1/4 in NPT port, a 40 um standard filter element, a manual drain on the polycarbonate bowl, and a round pressure gauge reading in bar. The standard regulator covers an adjustment range of 0.05-0.9 MPa (7-130 psi), maximum inlet pressure is 1.0 MPa (145 psi), and the operating temperature range is -5 to 70 C (non-freezing). No mounting bracket is fitted and no reverse/check valve is included.
This is a genuine AirTAC part from the GFR filter-regulator family, which spans sizes 200, 300, 400 and 600 with port sizes from 1/8 in to 1 in and PT, G or NPT threads. Drain, filter grade, gauge style and scale, bracket and low-pressure variants can be selected per code. Flow is published as curves rather than a single rated figure, so we confirm the datasheet and sizing figures on request before you order.
| Model | GFR300-08 AirTAC Filter Regulator, NPT1/4, 40 um |
|---|---|
| Series | GFR300 filter regulator |
| Port size | PT1/4" (NPT thread) |
| Filtering grade | 40 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 — round, 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. 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. |
| 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. |
| (blank) | Filtering grade 40 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 · PT1/4" · 40 µm |
|---|---|
| One size down | GFR200 |
| One size up | GFR400 |
| Add lubrication | GFC300-08 (two-unit set) |
Point-of-use preparation for the clean, regulated air feeding tool changers, clamps and air bearings on a CNC machining centre, with the bar gauge giving the operator a local pressure readout.
Filtering and regulating the supply to pneumatic cylinders and valves on a cartoning or wrapping line, where the manual-drain bowl is emptied during scheduled washdown and maintenance rounds.
Conditioning the air feeding grippers and vacuum-ejector circuits on a robotic handling cell, keeping moisture and swarf out of the control valves while holding a stable set pressure.
Choose the size and port step against the air demand of the circuit: this 300-size unit carries a 1/4 in NPT port, and larger sizes step up in both port and flow capacity. For drainage, manual suits installations where the bowl is checked as part of routine maintenance; automatic and differential-pressure drain options are available on other codes in the family. The 40 um element is the standard grade, with a 5 um element (code W) for finer pre-filtration. Gauge style and scale are selectable - this code carries a round gauge reading in bar, while an embedded square gauge with MPa, psi or bar scales is also offered. PT is the standard thread; G and NPT are order options, as NPT is here. A bracket (fitted by default on this family) can be omitted with code J.
Because published flow data is in curve form rather than a single rating, 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 GFR300 series as characteristic curves rather than a single rated figure, so no single flow number is quoted here. Contact us and we will confirm the datasheet and check the curve against your application's air demand before you order.
The M in the code GFR30008MJC3T means the polycarbonate bowl has a manual drain: collected condensate is released by hand during maintenance checks. If the installation is not visited regularly, an automatic or differential-pressure drain variant from the same family avoids relying on manual draining. Note that with a manual drain the regulator adjustment range is 0.05-0.9 MPa (7-130 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.