The AirTAC GFR300-08 NPT AirTAC Filter Regulator, 1/4 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 PT1/4" ports, a automatic drain and regulates 0.15 - 0.9 MPa (20 - 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 sets downstream pressure in a single 300-size body with a 1/4 in NPT port. This configuration carries the 5 um filter element (code W) for finer dirt and condensate capture than the standard 40 um grade, an automatic drain that expels collected condensate without manual attention, and a reverse/check valve that holds downstream pressure when the supply is lost. The embedded square gauge reads in bar, and the standard regulator adjusts over 0.15-0.9 MPa (20-130 psi) with a maximum inlet pressure of 1.0 MPa (145 psi). The polycarbonate bowl suits the 300 frame, and operating temperature is -5 to 70 C (non-freezing).
This is a genuine AirTAC part. The GFR family is available in sizes 200, 300, 400 and 600 with port sizes from 1/8 to 1 in, a choice of PT, G or NPT thread, manual, automatic or differential-pressure drains, 40 um or 5 um filtration, and gauge scale options. Flow is published as curves rather than a single rating, so we confirm the datasheet and sizing figures on request before you order.
| Model | GFR300-08 NPT AirTAC Filter Regulator, 1/4 in, 5 um |
|---|---|
| Series | GFR300 filter regulator |
| Port size | PT1/4" (NPT thread) |
| Filtering grade | 5 µm |
| Regulating range | 0.15 - 0.9 MPa (20 - 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 | Automatic drain |
| Bowl material | PC |
| Pressure gauge | Fitted — square, bar 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 0.15 - 0.9 MPa (20 - 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". |
| A | Drain: Automatic drain — this also sets the regulating band (0.15 - 0.9 MPa (20 - 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. |
| 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. |
| 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) |
Feeds the clamp cylinders on a CNC fixture line: the 5 um element keeps fine swarf and condensate out of the clamp valves, the regulator holds a steady clamping force, and the check valve keeps the fixture clamped if the shop air drops.
Sits at the air inlet of a carton-sealing or wrapping machine, cleaning and regulating the supply to the cylinders and vacuum generators, with the automatic drain handling condensate on a line that runs unattended through shifts.
Conditions the air feeding actuators and air bearings on a laboratory test bench, where the 5 um grade protects sensitive components and the bar-scale square gauge gives a direct local reading of the set pressure.
Start with the port step: the 300 size takes a 1/4 in port, and moving to size 400 or 600 buys more flow capacity at the cost of a larger footprint - match the step to the air demand of the circuit rather than oversizing by habit. Choose the drain to suit access: automatic (this model) suits units mounted high or in infrequently visited cells, manual suits attended stations, and differential-pressure draining is the default. Pick 5 um filtration (as here) where fine particulate matters, or the standard 40 um where coarse protection is enough. Select the gauge scale - MPa, psi or bar - and the thread: PT is the standard, with G and NPT as order options. A bracket is included on this configuration.
Flow for the GFR series is published as curves, not a single rated figure, so we do not quote a number here. Ask us to confirm the datasheet and check the curve against your application's demand 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, not as a single rated number, so we do not state a figure here. Ask us to confirm the datasheet and we will check the flow curve for the 300 size at your supply pressure against your application's demand before you order.
The W in the code selects the 5 um filter element instead of the standard 40 um grade, for finer particulate and condensate capture. The K in the code fits a reverse/check valve, which holds the regulated downstream pressure if the upstream supply is interrupted. Both are decodable order options on the GFR series.
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.