The AirTAC GFR300-10 AirTAC Filter Regulator, NPT3/8, 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 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 GFR-series filter regulator: water and particulate filtration plus downstream pressure regulation in a single body, with no lubricator. This size-300 unit is fitted with a 3/8 in NPT port. It is the low-pressure (L) type, so it is set up for circuits that run at reduced supply pressure rather than full line pressure. The manual drain (M) means condensate in the PC bowl is released by opening the drain valve by hand, so it suits installations visited as part of a routine maintenance walk. Filtration is the 40 um standard element, and the embedded square gauge fitted to this code reads in psi, giving a direct local readout of the regulated downstream pressure. A mounting bracket is included.
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, and options include automatic or differential-pressure drains, a 5 um (W) filter element, gauge scale in MPa, psi or bar, and G (BSPP) or NPT threads in place of the PT standard. Max inlet pressure is 1.0 MPa (145 psi) and the working temperature range is -5 to 70 C, non-freezing. Flow is published as curves rather than a single rating, so ask us and we will confirm the 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 | 40 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, 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). |
| F | Gauge shape: Square. C is round, F is square. |
| 2 | Gauge scale: psi. 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. |
| (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" · 40 µm |
|---|---|
| One size down | GFR200 |
| One size up | GFR400 |
| Add lubrication | GFC300-10 (two-unit set) |
Feeding a bench pneumatic press or clamping fixture where the tooling is rated below full line pressure: the low-pressure type regulates the circuit down, while the 40 um element keeps water and pipe scale out of the valve stack and cylinder seals.
Point-of-use conditioning for a cartoning or wrapping machine on an NPT-plumbed line: the combined filter regulator cleans the supply and holds a steady actuator pressure, with the psi gauge letting operators verify setpoint at a glance.
Supplying pilot rigs and lab automation skids that run at reduced pressure: the low-pressure regulator type matches the lower circuit demand, the manual drain suits a supervised environment, and the bracket gives clean panel mounting.
Start with the port: this unit is 3/8 in NPT on a size-300 body, so match it to your line size and the flow your circuit needs, stepping up to size 400 or 600 if the curve shows the 300 body is too small. Because this is the low-pressure (L) type, choose it where the regulated pressure sits well below standard ranges; the exact adjustment window for the low-pressure variant is not published, so confirm the setpoint with us before ordering. Drain choice matters: this code has a manual drain, which is fine for attended plants, while automatic or differential-pressure drains suit unattended or hard-to-reach installations. The 40 um element is the standard grade; specify W for 5 um where finer particulate removal is needed. The fitted square gauge reads psi; MPa or bar scales and an external round gauge are alternatives. Thread is NPT here, with G (BSPP) orderable, and a bracket is included. Flow is published as curves, not a single rating, so send us your air demand and let us 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. Without the K option, air cannot flow back 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 figure, so we do not quote a number here. Tell us your line pressure and the air demand of the equipment downstream, and we will confirm against the datasheet curves whether the size-300 body with its 3/8 in port is correctly sized before you order.
The M in the code GFR30010MLF2T specifies a manual drain: condensate collected in the PC bowl is released by hand when opened. That suits installations visited on a regular maintenance round. If the unit will sit in an unattended or hard-to-reach position, an automatic (A) or differential-pressure (blank) drain version removes the need for manual intervention - those are orderable variants of the same GFR300 filter regulator.
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.