The AirTAC GFR300-08 AirTAC Filter Regulator PT1/4, round gauge psi 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 differential-pressure 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 300-size filter regulator that removes water and particulate from compressed air and holds downstream pressure in a single body. This configuration is threaded PT1/4 (1/4 in PT; G and NPT are order options), uses the standard 40 um filter element, and drains condensate by differential pressure, so the bowl self-drains as flow passes through it. The regulator is the standard type with an adjustment range of 0.15-0.9 MPa (20-130 psi), and this code carries an external round gauge reading in psi. The polycarbonate bowl is rated for a maximum inlet pressure of 1.0 MPa (145 psi), and the unit operates in temperatures from -5 to 70 C (non-freezing). No mounting bracket is included with this code.
This is a genuine AirTAC part. The GFR family is available in sizes 200, 300, 400 and 600 with ports from 1/8 to 1 in, and with choices of drain type, 40 um or 5 um (W) filtration, gauge style and scale, thread, and bracket. Flow figures are published as curves rather than a single rating, so ask us and we will confirm the datasheet figures for your application on request.
| Model | GFR300-08 AirTAC Filter Regulator PT1/4, round gauge psi |
|---|---|
| Series | GFR300 filter regulator |
| Port size | PT1/4" (PT thread) |
| Filtering grade | 40 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 | Differential-pressure drain |
| Bowl material | PC |
| Pressure gauge | Fitted — round, psi 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 0.15 - 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". |
| (blank) | Drain: Differential-pressure 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. |
| J | Supplied without bracket. |
| (blank) | Pressure gauge fitted (blank). |
| C | Gauge shape: Round. C is round, F is square. |
| 2 | Gauge scale: psi. 1 is MPa, 2 is psi, 3 is bar. |
| (blank) | Filtering grade 40 µm. Only 40 µm (blank) and 5 µm (W) exist. |
| (blank) | PT 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) |
On a carton-sealing or case-packing line, the GFR300-08 sits at the drop to the machine, cleaning water and debris out of the supply and holding a steady setting for the cylinders that drive the sealing heads and product pushers.
Fitted at the air inlet of a CNC machining centre or lathe, it protects the tool-changer and clamping circuits from condensate and particles while keeping the regulated pressure that those clamps and actuators were set up for.
On a distribution-centre conveyor with pneumatic diverters and stop gates, the unit conditions the branch feed and pins the pressure so the gates fire consistently through every shift.
Start with the port step: this 300-size unit takes PT1/4, and the family steps up through 400 and 600 sizes with larger ports if your line needs more capacity - match the size to the flow your circuit actually draws. Choose the drain to suit access: differential-pressure (as here) drains with flow, automatic (A) empties the bowl on its own, and manual (M) needs someone to open it. Pick the filter grade for the downstream hardware: 40 um standard is right for general actuation, while the 5 um (W) element suits finer instrument air. For the gauge, the embedded square gauge is standard and the external round gauge is optional, with MPa, psi or bar scales - this code is a round gauge in psi. Thread is PT as standard with G (BSPP) and NPT as order options, and a bracket (J = none, as here) can be added for panel or wall fixing. Flow is published as curves, not a single rated figure, 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 number, so there is no one figure we can quote honestly. Tell us your application and we will confirm the relevant flow and datasheet figures for the GFR300-08 on request before you order.
The C2 in the code GFR30008JC2 specifies the optional external round gauge with a psi scale; the embedded square gauge is the standard fitting, and MPa or bar scales are also available. If you need a different gauge style or scale, we can quote the matching GFR300 code.
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.