The AirTAC GFR300-10 AirTAC Filter Regulator 3/8in NPT 5um Bar Gauge 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 GFR300-10 is an AirTAC GFR300 filter regulator: a water-and-particulate filter and a pressure regulator combined in a single body. This configuration is the 300 size with a 3/8 in NPT port, a fine 5 um filter element (code W), a manual drain for emptying the bowl, and the low-pressure type regulator for applications that run below the standard range. The embedded square gauge is fitted with a bar scale, a reverse/check valve is included, and the unit is supplied without a mounting bracket. Maximum inlet pressure is 1.0 MPa (145 psi) and the working temperature range is -5 to 70 C, non-freezing. The bowl on this 300 size is polycarbonate (PC).
This is a genuine AirTAC part. The GFR filter-regulator line spans sizes 200, 300, 400 and 600 with port sizes from 1/8 in to 1 in, and is configurable by thread (PT standard, G and NPT as order options), drain type (differential-pressure, automatic or manual), filter grade (40 um standard, 5 um optional), gauge scale and bracket. Flow is published by AirTAC as curves rather than a single rated figure, so we confirm the datasheet and sizing figures on request before you order.
| Model | GFR300-10 AirTAC Filter Regulator 3/8in NPT 5um Bar Gauge |
|---|---|
| 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 — square, 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". |
| 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. |
| J | Supplied without bracket. |
| (blank) | Pressure gauge fitted (blank). |
| F | Gauge shape: Square. 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 bench or C-frame press with air-operated clamps, this unit filters the shop air to 5 um and holds a low regulated pressure so clamp force stays consistent from stroke to stroke; the manual drain is emptied at shift start.
Air-driven pushers and diverters on a carton conveyor line run best from clean, gently regulated air; the GFR300-10 conditions the 3/8 in drop feeding those actuators and its bar gauge lets the line technician verify set pressure at a glance.
Benchtop sample-handling and dispensing stations use low-pressure air for gentle actuation; the low-pressure type regulator and 5 um filtration protect the small valves and cylinders in these instruments, with the check valve holding the set circuit if supply dips.
Size and port step up with required flow: the GFR300 with a 3/8 in NPT port sits in the middle of the 200/300/400/600 range, so move up a size if your line draws more air than a 3/8 in feed comfortably carries. Because flow is published as curves and not a single rating, ask us to confirm sizing against your application before ordering. This unit is the low-pressure (L) type, chosen when the regulated output must sit below the standard range; the exact low-pressure range is not published, so confirm it with us. The 5 um element (W) suits air that feeds sensitive valves, cylinders or instruments; the 40 um standard element is enough for general shop-air protection. The manual drain means an operator opens the drain to empty collected water - choose the automatic drain if the unit is hard to reach. The fitted square gauge reads in bar; MPa and psi scales are available, and an external round gauge is optional. NPT is an order option on this code; PT is the standard thread, and G is also offered. A bracket is available if you want panel or surface mounting - this code omits it.
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 GFR flow as performance curves, not as a single rated number, so there is no one figure we can honestly quote. Tell us your inlet pressure, set pressure and the air demand of the equipment, and we will confirm the correct size from the datasheet before you order.
The manual drain (code M) means collected water is emptied by opening the drain when needed - simple and reliable if the unit is accessible, while the automatic drain option suits hard-to-reach installs. The 5 um element (code W) is the finer of the two grades and is the right choice when the downstream air feeds precision valves, cylinders or instruments; the 40 um standard element covers general workshop protection.
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.