The AirTAC GFR300-10 NPT AirTAC Filter Regulator 3/8 in 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 PT3/8" 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 GFR300-10 is a 300-size filter regulator that removes water and particulate from compressed air and regulates downstream pressure in a single body. This configuration has NPT 3/8 in ports, is the low-pressure regulator type, carries the standard 40 um filter element, and uses a differential-pressure drain that bleeds condensate automatically whenever the pressure differential across the bowl is high enough. No gauge is fitted (code N), a reverse/check valve is included (code K), and no mounting bracket is supplied (code J), so plan to mount it in-line with your own hardware.
This is a genuine AirTAC part. The GFR family spans sizes 200, 300, 400 and 600 with port sizes from 1/8 in to 1 in, optional 5 um filtration (code W), manual or automatic drain variants, gauge options, and PT, G or NPT threads. Flow is published as curves rather than a single rating, so ask us to confirm the datasheet figures for your application before ordering.
| Model | GFR300-10 NPT AirTAC Filter Regulator 3/8 in Low-Pressure |
|---|---|
| Series | GFR300 filter regulator |
| Port size | PT3/8" (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 | Not fitted |
| 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". |
| (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. |
| N | No pressure gauge (N). |
| (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. |
| 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" · 40 µm |
|---|---|
| One size down | GFR200 |
| One size up | GFR400 |
| Add lubrication | GFC300-10 (two-unit set) |
On a CNC fixture line, the GFR300-10 sits upstream of the clamping cylinders, cleaning water and chips-laden condensate out of the shop air and holding the clamp circuit at the lower pressure the fixture designer specified.
On a carton-forming packaging machine, this unit feeds one valve-and-actuator station from the main drop, keeping rust and water out of the directional valve while the low-pressure type regulates the station circuit to the pressure the machine builder set.
In a small-parts assembly cell, the unit conditions the branch feeding gripper and rotary actuators, protecting seals from moisture and particulate while the reverse/check valve helps hold the downstream circuit if supply pressure is interrupted.
Start with the port step: this unit is 3/8 in NPT in the 300 size; step up to 400 or 600 if your line runs larger ports, or down to 200 for compact circuits. Because flow is published as curves rather than a single rated figure, send us your application details and we will confirm sizing against the datasheet before you order. The low-pressure regulator type in this code is intended for circuits held below the standard regulator range; we will confirm the exact adjustment window on request. Drain is differential-pressure here; a manual-drain (M) or automatic-drain (A) variant can be ordered if your maintenance routine prefers it. Filtration is the standard 40 um; specify code W for the 5 um element if downstream equipment needs finer air. No gauge is fitted on this code, so add a separate gauge or order a gauge variant if you want a visual setpoint reference. Thread is NPT as ordered; PT is the catalogue standard and G (BSPP) is also available. If you need a mounting bracket, order the variant without the J code.
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 the GFR series as performance curves, not as a single rated number, so there is no one figure we can honestly quote. Send us your line pressure, downstream demand and port size, and we will confirm the relevant curve and datasheet figures for the GFR300-10 before you order.
The N code means no pressure gauge is supplied, and the J code means no mounting bracket either. You can fit your own gauge to the circuit, or order a GFR300-10 variant with the gauge code instead of N (round or square gauge, with MPa, psi or bar scale). Tell us which scale you prefer and we will confirm the available variant.
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.