The AirTAC GFR300-08 AirTAC Filter Regulator NPT1/4 Low-Pressure 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 GFR300-08 is a filter regulator: it removes water and particulate from compressed air and regulates downstream pressure in one body. This configuration is the GFR300 size with a 1/4 in NPT port, the standard 40 um filter element, and an automatic drain that ejects collected condensate without manual attention. It is the low-pressure (L) regulator type, fitted with an embedded square gauge scaled in MPa, a reverse/check valve, and a mounting bracket.
This is a genuine AirTAC part. The GFR family spans sizes 200, 300, 400 and 600 with ports from 1/8 in to 1 in, drain choices (differential-pressure, automatic or manual), an optional 5 um element (code W), and G/NPT thread options to order. Max inlet pressure is 1.0 MPa (145 psi) and operating temperature is -5 to 70 C, non-freezing. Rated flow is published as curves rather than a single figure, so ask us to confirm the datasheet figures for your application.
| Model | GFR300-08 AirTAC Filter Regulator NPT1/4 Low-Pressure |
|---|---|
| Series | GFR300 filter regulator |
| Port size | PT1/4" (NPT thread) |
| Filtering grade | 40 µm |
| Regulating range | 0.15 - 0.9 MPa (20 - 130 psi) |
| Pressure type | Low-pressure 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, 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. The low-pressure type adjusts over a lower band than standard; we confirm the exact figures from the factory datasheet. 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)). |
| L | Low-pressure 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. |
| (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. |
| 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" · 40 µm |
|---|---|
| One size down | GFR200 |
| One size up | GFR400 |
| Add lubrication | GFC300-08 (two-unit set) |
On a machining fixture where clamps must close at a reduced, stable pressure, this filter regulator cleans the shop air, sets the low working pressure, and the built-in check valve helps hold the downstream setting if supply pressure dips.
Feeding the pick-and-place and sealing cylinders on a carton-sealing conveyor, the GFR300-08 strips water and 40 um-scale particulate from the header air and regulates a consistent pressure so the cylinders stroke repeatably through the shift.
In a small paint-spray booth, atomising and blow-off air is best run at reduced pressure. This low-pressure type filter regulator conditions the line and sets the lower working pressure, with the automatic drain clearing condensate before it reaches the gun.
Pick the size by port and required flow: GFR300 carries a 1/4 in port, while larger sizes step up through 3/8 in, 1/2 in, 3/4 in and 1 in. This unit is the low-pressure (L) type - choose it where the circuit works below the standard regulator's range; we confirm the exact adjustment range on request. The drain here is automatic; differential-pressure and manual drains are the other catalogue choices. The filter grade is the standard 40 um, with 5 um (code W) available where finer filtration is needed. The square gauge is scaled in MPa, with psi and bar scales as options, and the thread is NPT here (PT is the standard; G is available to order). Flow 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 this family as curves, not as a single rated figure, so we do not quote a number here. Send us your line pressure, port size and application details, and we will confirm the datasheet flow curve and check the sizing for you before you order.
L marks the low-pressure regulator type, intended for circuits that work below the standard type's range; the exact adjustment range for this type is not published, so we confirm it on request. On the drain side, this unit's automatic drain ejects collected condensate by itself, whereas the manual drain needs operator attention and the differential-pressure drain (the family default) responds to the pressure drop across the element.
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.