The AirTAC GFR300-10 AirTAC Filter Regulator NPT3/8 Low-Pressure is a genuine G-series filter regulator: water separation, 5 µm particulate filtration and balanced-type pressure regulation combined in a single body. It has PT3/8" 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 GFR300-10 is a filter regulator: one body that removes water and particulate from compressed air and regulates downstream pressure. This 300-size unit has 3/8 in NPT ports, a 5 um filter element (code W), an automatic drain that discharges collected condensate without manual attention, and a round pressure gauge scaled in bar. It is the low-pressure (L) regulator type and carries a reverse/check valve (K); no mounting bracket is fitted. Maximum inlet pressure is 1.0 MPa (145 psi), the working temperature range is -5 to 70 C (non-freezing), and the polycarbonate bowl suits this 300 size.
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, and options for manual or differential-pressure drains, 40 um or 5 um filtration, embedded square or external round gauges with MPa, psi or bar scales, PT, G or NPT threads, a reverse/check valve and a mounting bracket. Flow is published as curves rather than a single rating, so ask us to confirm sizing and datasheet figures for your application.
| Model | GFR300-10 AirTAC Filter Regulator NPT3/8 Low-Pressure |
|---|---|
| Series | GFR300 filter regulator |
| Port size | PT3/8" (NPT thread) |
| Filtering grade | 5 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 — round, bar 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. |
|---|---|
| 10 | Port size PT3/8". 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. |
| J | Supplied without bracket. |
| (blank) | Pressure gauge fitted (blank). |
| C | Gauge shape: Round. C is round, F is square. |
| 3 | Gauge scale: bar. 1 is MPa, 2 is psi, 3 is bar. |
| W | Filtering grade 5 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 · PT3/8" · 5 µm |
|---|---|
| One size down | GFR200 |
| One size up | GFR400 |
| Add lubrication | GFC300-10 (two-unit set) |
On a carton packing line, the low-pressure regulator holds a gentle supply to gripper cylinders and vacuum ejectors, while the 5 um element and automatic drain keep condensate and fine particles away from the actuators.
Feeding pneumatic clamps on a CNC fixture, the unit filters the shop air to 5 um, regulates it to the clamp's lower working pressure, and the reverse/check valve helps hold the setting if the main supply dips.
Supplying bench-top analytical instruments, the 5 um filtration protects sensitive components from particulate and water carryover, and the bar-scaled gauge gives operators a clear reading of the regulated line pressure.
Pick the size and port against the air your line consumes: this unit is 300 size with 3/8 in NPT ports. Drain choices are automatic (fitted here), manual or differential-pressure; the 5 um element (code W) suits points where finer filtration matters, while 40 um is the standard grade. Gauge options are the embedded square type or an external round gauge scaled in MPa, psi or bar - this unit carries a round bar gauge. Threads can be ordered in PT (standard), G or NPT, and a bracket can be specified where the J (no bracket) build does not suit your mounting. The L code marks the low-pressure regulator type, intended for lower downstream settings than the standard build; its exact adjustment range is not published, so confirm it with us. Flow is published as curves, not a single rating - ask us to check the curve against your demand 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 as curves rather than a single rated figure, so we do not quote a number here. Send us your application's air demand and we will confirm sizing against the datasheet curve on request before you order.
L marks the low-pressure regulator type, intended for lower downstream pressure settings than the standard GFR build. Its exact adjustment range is not published in the catalogue, so confirm the range with us before ordering if your process needs a specific setting.
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.