The AirTAC GFR300-10 AirTAC Filter Regulator PT3/8 5um 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 filter regulator: one body that both removes water and particulate from compressed air and regulates downstream pressure. This 300-size unit is specified with 3/8 in PT ports, a 5 um filter element (finer than the standard 40 um grade) for cleaner air at the point of use, and a manual drain, so the bowl is emptied by opening its drain valve during routine checks. It is the low-pressure type, intended for circuits that run reduced set pressures, and it carries a round pressure gauge reading in psi. The polycarbonate bowl lets you see condensate at a glance, and a mounting bracket is included. Maximum inlet pressure is 1.0 MPa (145 psi) and the working temperature range is -5 to 70 C (non-freezing).
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, a choice of differential-pressure, automatic or manual drains, 40 um or 5 um filtration, embedded square or external round gauges in MPa, psi or bar scales, and PT, G or NPT threads. Flow is published as curves rather than a single rated figure, so ask us and we will confirm the datasheet figures for your application on request.
| Model | GFR300-10 AirTAC Filter Regulator PT3/8 5um Low-Pressure |
|---|---|
| Series | GFR300 filter regulator |
| Port size | PT3/8" (PT 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 | 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. |
|---|---|
| 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. |
| (blank) | PT 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 · PT3/8" · 5 µm |
|---|---|
| One size down | GFR200 |
| One size up | GFR400 |
| Add lubrication | GFC300-10 (two-unit set) |
Feeding sealing heads and low-pressure clamping actuators on a packaging line, where the low-pressure regulator type holds a reduced set pressure and the 5 um element keeps fine debris out of the machine's control valves.
A point-of-use filter regulator on a conveyor line's diverter gates and stop-gate cylinders: the manual-drain bowl is emptied during scheduled line checks, and the psi gauge lets line staff verify supply pressure at a glance.
Supplying test rigs and pilot-scale pneumatic fixtures that need fine 5 um filtration and gentle, low-pressure regulation, with the round psi gauge giving a clear reading for repeatable test setups.
Start with the port step: this unit is 3/8 in PT, one step up from the 1/4 in 200/300 base sizes, so pick it when your piping or flow path calls for 3/8 in. Choose the drain to match maintenance habits: manual (as here) means an operator opens the drain during checks, automatic drains on its own, and the differential-pressure default drains only when the pressure drop warrants it. The 5 um element (code W) suits air lines feeding sensitive valves or instruments; the 40 um standard grade is fine for general cylinders. Gauges: this configuration is fitted with an external round gauge on the psi scale; the embedded square gauge is the standard alternative, with MPa, psi or bar scales to order. Thread is PT as standard, with G (BSPP) and NPT available as order options, and a mounting bracket is included.
One honest note on sizing: AirTAC publishes flow as curves, not a single rated number, so send us your application details and we will confirm the sizing and the low-pressure regulation range 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 rather than a single rated figure, so we do not quote a l/min or SCFM number. Send us your application details and we will confirm the flow curve and sizing against the datasheet on request.
The manual drain means the polycarbonate bowl is emptied by opening its drain valve during routine maintenance, which suits lines with regular operator checks; automatic and differential-pressure drains are available as order options. The 5 um element (code W) filters more finely than the 40 um standard grade, which is worth choosing when the downstream air feeds valves, instruments or other sensitive components.
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.