The AirTAC GFR300-10 AirTAC Filter Regulator 3/8 in NPT 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 manual drain and regulates 0.05 - 0.9 MPa (7 - 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: one body that removes water and particulate from compressed air and holds downstream pressure at a set point. This configuration has 3/8 in NPT ports, a 5 um filter element (code W), a manual-drain polycarbonate bowl, the low-pressure regulator type, a round pressure gauge reading in psi, a built-in reverse (check) valve, and a mounting bracket included.
It is a genuine AirTAC part from the G-series, which spans sizes 200, 300, 400 and 600 with ports from 1/8 to 1 in and options for drain type, 40 um or 5 um filtration, gauge style and scale, G or NPT threads, and bracket choice. Flow is published as curves rather than a single rating, so ask us to confirm sizing and any datasheet figure for your application before ordering.
| Model | GFR300-10 AirTAC Filter Regulator 3/8 in NPT Low-Pressure |
|---|---|
| Series | GFR300 filter regulator |
| Port size | PT3/8" (NPT thread) |
| Filtering grade | 5 µm |
| Regulating range | 0.05 - 0.9 MPa (7 - 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 | Manual drain |
| Bowl material | PC |
| Pressure gauge | Fitted — round, psi 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". |
| M | Drain: Manual drain — this also sets the regulating band (0.05 - 0.9 MPa (7 - 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. |
| 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) |
Point-of-use preparation for the air feeding a machining centre's pneumatic clamps and tool-change actuators: the 5 um element strips water and fine particulate before they reach the clamp cylinders, while the regulator holds the clamping circuit at its set point and the check valve holds pressure if supply dips.
Feeding spray guns and atomising air on a paint or coating line, where the low-pressure regulator type holds a reduced, stable set point for atomising and the 5 um grade keeps oil-carryover debris and moisture out of the finish. The manual drain suits a booth attended each shift.
Conditioning the supply to conveyor diverters, pushers and bag-seal cylinders on a packaging line: filtered, regulated air keeps stroke timing consistent, the psi gauge gives operators a visible set point, and the included bracket mounts the unit at the line's drop.
Start with the port step: this unit is 3/8 in NPT on the 300 body; step up to 400 or 600 if the circuit needs more flow capacity, and match the thread to your piping (PT is the standard, G and NPT are order options). Choose the drain to suit attendance: manual (as here) needs periodic bowl draining, while automatic and differential-pressure versions drain without an operator. Pick 5 um (this unit) where downstream equipment needs finer filtration than the 40 um standard. The low-pressure regulator type suits circuits held at reduced set points; its exact adjustment range is not published in our data, so we confirm it on request. Gauge scale (here psi, round external style) and the fitted reverse/check valve round out the decode.
Because AirTAC publishes flow as curves and not a single rated figure, send us your application details 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. 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 curves, not as a single rated number, so we do not quote a l/min or SCFM figure. Send us your application - downstream cylinders, expected consumption and supply pressure - and we will confirm the sizing from the datasheet on request. The 300 size with 3/8 in NPT ports sits mid-range in the G-series, which steps from 1/8 in (size 200) to 1 in (size 600).
The M in the code means the polycarbonate bowl is drained by hand: an operator opens the drain periodically to discharge collected water. If the installation is unattended or runs continuously, the same GFR300 family is available with an automatic drain (code A) or a differential-pressure drain (the default), which discharge condensate without an operator. Maximum inlet pressure is 1.0 MPa (145 psi) and the working temperature range is -5 to 70 C, non-freezing.
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.