The AirTAC GFR300-08L 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 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 GFR300-08LJC1TK is a filter regulator: it removes water and particulate from compressed air and regulates downstream pressure in a single 300-size body with a 1/4 inch NPT port. This unit is the low-pressure type (code L), built for circuits that hold a reduced set pressure rather than full line pressure. It carries the standard 40 um filter element, a differential-pressure drain that bleeds accumulated condensate as the pressure differential across the element rises, a round external gauge scaled in MPa, and a built-in reverse/check valve that holds downstream settings when upstream supply is lost. No mounting bracket is included with this configuration.
This is a genuine AirTAC part. The GFR family is offered in sizes 200, 300, 400 and 600 with a choice of PT, G (BSPP) or NPT thread, 40 um or 5 um (W) filtration, differential-pressure, automatic or manual drains, and square or round gauges in MPa, psi or bar scales. Flow is published in the AirTAC catalogue as curves rather than a single rated figure, so ask us to confirm the datasheet and sizing figures for your application on request.
| Model | GFR300-08L 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 | Differential-pressure drain |
| Bowl material | PC |
| Pressure gauge | Fitted — round, 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". |
| (blank) | Drain: Differential-pressure 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. |
| J | Supplied without bracket. |
| (blank) | Pressure gauge fitted (blank). |
| C | Gauge shape: Round. 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) |
Feeds the clamp cylinders of a bench press through a 1/4 inch line, filtering supply air and holding a reduced, stable clamp pressure set below full line pressure, with the check valve keeping the setting if the supply dips.
Conditions the air feeding small cylinders and diverters on a carton-sealing conveyor, removing water and 40 um particulate before the low-pressure regulator sets the gentle pressure those actuators need.
Provides filtered, low-pressure regulated air to analytical benchtop equipment and purge jets, with the MPa gauge giving a clear set-point readout and the differential-pressure drain keeping the bowl clear in continuous service.
Size and port: the 300 size with a 1/4 inch port sits in the middle of the GFR range; step up to 400 or 600 when the circuit demands more flow, or down to 200 for compact points of use. Drain: this unit uses the differential-pressure drain (the default); choose automatic (A) for unattended condensate removal or manual (M) where you want deliberate draining. Filtration: 40 um is the standard element here; specify 5 um (code W) if downstream valves or instruments need finer protection. Gauge: this configuration includes the external round gauge in MPa; square embedded gauges and psi or bar scales are alternatives. Thread: NPT is ordered as the T option, with PT as the catalogue standard and G (BSPP) also available. The L code makes this a low-pressure regulator and the K code fits a reverse/check valve; no bracket is supplied. Flow for this family 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 GFR300 flow as performance curves in the catalogue rather than a single rated number, so we do not quote a figure here. Tell us your application and we will confirm the datasheet and the appropriate sizing on request before you order.
L marks the low-pressure regulator type, intended for circuits that hold a reduced set pressure instead of full line pressure. K means a reverse/check valve is fitted, so downstream pressure is held if the upstream supply is interrupted. This configuration also has a differential-pressure drain, a 40 um element, a round MPa gauge, a 1/4 inch NPT port and no bracket.
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.