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 GFR300-08LC2T is a size 300 filter regulator that removes water and particulate from compressed air and regulates downstream pressure in a single body. This configuration carries a 1/4 in NPT port, the standard 40 um filter element, and a differential-pressure drain that bleeds accumulated condensate automatically whenever the pressure differential across the element rises. It is the low-pressure (L) type, so it is intended for circuits that run below the standard regulator band, and it is supplied with a bracket for panel or wall mounting. An external round gauge with a psi scale is fitted so operators can read and set the outlet pressure directly.
This is a genuine AirTAC part from the GFR300 series, one of four sizes (200, 300, 400, 600) with ports from 1/8 in to 1 in and PT, G or NPT thread options. Maximum inlet pressure is 1.0 MPa (145 psi) and the operating temperature range is -5 to 70 C, non-freezing; the polycarbonate bowl suits this size. Flow is published as curves rather than a single rated figure, so ask us to confirm the datasheet figures for your application before ordering.
| 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, 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. 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. |
| (blank) | Mounting bracket included. |
| (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. |
| T | NPT 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) |
Fixture clamps and swing cylinders that must close gently at a reduced outlet pressure get filtration and regulation from one body, with the psi gauge letting the setter dial in the clamp force without a separate filter unit ahead of it.
On a cartoning or wrapping line, this unit conditions the air feeding small actuator valves: the 40 um element stops particulate reaching the valve seats while the regulator holds a steady, low outlet band for consistent cycle behaviour.
Test benches and lab apparatus that need clean, low-pressure air at a 1/4 in connection use this unit to strip water and debris and hold a stable setpoint, with the differential-pressure drain keeping the polycarbonate bowl clear between runs.
Start with the port step: this unit is 1/4 in NPT, and the G-series ladder runs 1/8, 1/4, 3/8, 1/2, 3/4 and 1 in across sizes 200 to 600, so step up a size if your line needs more flow capacity. The 40 um element is the standard grade; if the circuit needs finer filtration, the 5 um (W) variant is the catalogue option to specify instead. Drain choice matters: differential-pressure (this unit) drains on element loading, automatic drains continuously, and manual drain (M) suits low-moisture installations - and note the manual-drain variant widens the regulator adjust range, so confirm the exact low-pressure band for this L-type with us. Thread is NPT here; PT and G are order options. Bracket is included, and the fitted round gauge reads in psi (MPa and bar scales are alternatives).
Because flow is published as curves and not a single rating, and the low-pressure type's adjustment band is not a published figure, send us your line pressure, downstream demand and required outlet band and we will confirm sizing against the datasheet before you order.
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 this series as curves, not as a single rated number, so we do not quote a l/min or SCFM figure. Send us your line pressure and downstream demand and we will confirm the relevant datasheet flow figures for the size 300, 1/4 in unit on request before you order.
L marks the low-pressure regulator type, intended for circuits that run below the standard adjustment band. The exact adjustment range for this low-pressure variant is not a published figure, so confirm it with us against the datasheet. Everything else in the code decodes as: 1/4 in NPT port, 40 um element, differential-pressure drain, round psi gauge, bracket included, no reverse valve.
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.