The AirTAC GFR300-08G AirTAC Filter Regulator G1/4 Auto Drain psi Gauge 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 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 GFR300-08G is a filter regulator: it removes water and particulate from compressed air and regulates downstream pressure in a single 300-size body. This configuration has G (BSPP) 1/4 in ports, an automatic drain that expels collected condensate without manual attention, a 40 um standard filter element, and a fitted square gauge reading in psi. Maximum inlet pressure is 1.0 MPa (145 psi), the standard regulator adjusts from 0.15-0.9 MPa (20-130 psi), and the operating temperature range is -5 to 70 C (non-freezing). The polycarbonate bowl suits the 300 size, and a mounting bracket is included.
This is a genuine AirTAC part. The GFR family is offered in sizes 200, 300, 400 and 600 with ports from 1/8 to 1 in, and with choices of drain type (differential-pressure, automatic or manual), filter grade (40 um standard, 5 um optional), gauge scale (MPa, psi or bar), thread (PT standard, G or NPT to order) and bracket. Flow is published as curves rather than a single rated figure, so ask us and we will confirm the datasheet figures for your application on request.
| Model | GFR300-08G AirTAC Filter Regulator G1/4 Auto Drain psi Gauge |
|---|---|
| Series | GFR300 filter regulator |
| Port size | PT1/4" (G (BSPP) 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 | Automatic drain |
| Bowl material | PC |
| Pressure gauge | Fitted — square, 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". |
| 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. |
| 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. |
| G | G (BSPP) 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) |
Mounted ahead of a small pneumatic press, this unit dries and filters the plant air feed and holds a steady regulated pressure so cylinder stroke force stays repeatable through the shift, with the automatic drain clearing condensate on its own.
Feeding the air cylinders and ejectors that push cartons between conveyor lanes, this filter regulator keeps water and pipe scale out of the divertor valves while the psi gauge lets the line technician set and verify the switching pressure at a glance.
At the bench supply for lab actuators and sample-handling cylinders, this unit cleans the compressed air and drops it to the working pressure the instruments need, with the 40 um element guarding sensitive pneumatic components upstream.
Size and port step up with required flow: this 300-size unit carries 1/4 in G-thread ports; move to 400 or 600 if your line needs more air, or down to 200 for compact points of use. The automatic drain on this model suits unattended installations; choose manual drain where an operator is on hand, or the differential-pressure default where drain timing should track loading. The 40 um element is the standard grade for general plant air; specify the W code for the 5 um element where finer filtration matters. The fitted square gauge here reads in psi; MPa and bar scales are available, and an external round gauge is optional. PT is the standard thread; G and NPT are catalogue options to order. A bracket is included.
Because flow is published as curves 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 GFR series as curves rather than a single rated figure, so we do not quote one number here. Tell us your application and we will confirm the relevant flow and sizing figures from the datasheet on request before you order.
The A in the code GFR30008AF2G specifies the automatic drain, which ejects collected condensate by itself and suits unattended installations. The GFR300 is also catalogued with the differential-pressure drain (default) or a manual drain (M), and the regulator adjustment range differs by drain type: 0.15-0.9 MPa (20-130 psi) for automatic and differential-pressure drains, 0.05-0.9 MPa (7-130 psi) for manual.
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.