The AirTAC GFR300C08ALJF1TK 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 See datasheet 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 GFR300C08ALJF1TK is an AirTAC GFR-series filter regulator: one body that strips water and particulate from compressed air and regulates the pressure delivered downstream. This 300-size unit carries a 1/4 in NPT port, an automatic drain that clears collected condensate without manual attention, the standard 40 um filter element, and the low-pressure (L) regulator type for circuits set below ordinary line pressure. It is supplied with the embedded square gauge on an MPa scale and a fitted reverse/check valve, mounts without a bracket, and is rated to 1.0 MPa (145 psi) inlet over -5 to 70 C (non-freezing).
This is a genuine AirTAC part. The GFR family runs from 200 through 600 sizes with ports from 1/8 in to 1 in, PT thread as standard and G or NPT to order, plus a choice of drain type, 40 um or 5 um (W) filtration, gauge style and scale, and bracket options. Flow is published as curves rather than a single rated number, so we confirm datasheet figures for your application on request.
| Model | GFR300C08ALJF1TK AirTAC Filter Regulator NPT1/4 Low-Pressure |
|---|---|
| Series | GFR300 filter regulator |
| Port size | See datasheet (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 — factory standard, Factory standard 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. |
|---|---|
| C0 | Port size See datasheet. 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. |
| (blank) | Mounting bracket included. |
| (blank) | Pressure gauge fitted (blank). |
| (blank) | Gauge shape: Factory standard. C is round, F is square. |
| (blank) | Gauge scale: Factory standard. 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 · See datasheet · 40 µm |
|---|---|
| One size down | GFR200 |
| One size up | GFR400 |
| Add lubrication | GFC300-C0 (two-unit set) |
On a paint line, the 40 um element removes water and grit before the gun while the low-pressure regulator lets the operator hold a gentle, repeatable atomizing-air setting on the square gauge.
Fixture clamps on a machining cell need steady pressure below the main line; this filter regulator conditions the supply and sets the clamp force locally, with the check valve holding the circuit if supply dips.
Pick-and-place cylinders and flap actuators on a packaging conveyor run on clean, regulated air; the automatic drain keeps the bowl clear through continuous shifts without an operator stopping to bleed it.
Size and port step up together: 200, 300, 400 and 600 cover 1/8 in through 1 in, so match the 300 / NPT1/4 combination to your line size and expected air demand. The decodable choices on this unit are: automatic drain (condensate is ejected without daily manual draining), the 40 um standard element (5 um available as code W), the low-pressure regulator type, the embedded square gauge on an MPa scale (external round gauge optional, MPa/psi/bar), NPT thread (PT is standard, G to order), a fitted reverse/check valve, and no mounting bracket. Because AirTAC publishes flow only as curves, not a single rated figure, 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 GFR300 flow as curves, not a single rated figure, so we do not quote a number here. Send us your line size and air demand and we will confirm the datasheet curve for this exact model on request.
L marks the low-pressure regulator type, intended for circuits set below standard line pressure. Its exact adjustment range is not published in our current data, so we confirm it on request; by contrast, the standard-type GFR300 with automatic drain adjusts 0.15-0.9 MPa (20-130 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.