The AirTAC GFR300-15L AirTAC Filter Regulator, NPT1/2, 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 PT1/2" 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 GFR300-15L is a 300-size filter regulator that removes water and particulate from compressed air and regulates downstream pressure in a single body. This configuration is the low-pressure type (L), fitted with an external round gauge on the MPa scale, a reverse/check valve (K), and the differential-pressure drain, which bleeds condensate automatically as flow passes through. The bowl is polycarbonate, filtration is the 40 um standard grade, and the port is 1/2 in NPT thread. 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 is available in 200, 300, 400 and 600 sizes with port sizes from 1/8 to 1 inch, PT as the standard thread and G or NPT as order options, plus a choice of drain type, 40 um or 5 um filtration, gauge style and scale, and bracket or no-bracket mounting. Flow is published as curves rather than a single rating, so ask us and we will confirm the datasheet figures for your application on request.
| Model | GFR300-15L AirTAC Filter Regulator, NPT1/2, Low-Pressure |
|---|---|
| Series | GFR300 filter regulator |
| Port size | PT1/2" (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 | Fitted — round, MPa 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. |
|---|---|
| 15 | Port size PT1/2". 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. |
| (blank) | Pressure gauge fitted (blank). |
| C | Gauge shape: Round. C is round, F is square. |
| 1 | Gauge scale: MPa. 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 · PT1/2" · 40 µm |
|---|---|
| One size down | GFR200 |
| One size up | GFR400 |
| Add lubrication | GFC300-15 (two-unit set) |
On a CNC fixture circuit where workpieces are held at low regulated pressure to avoid marking, the GFR300-15L filters the shop air and holds the reduced setting, with the round MPa gauge giving the operator a direct pressure readout.
Packaging lines often run seal bars and hold-down cylinders at reduced pressure. This 300-size unit with a 1/2 in NPT port conditions the incoming air and regulates the low-pressure leg, while the reverse/check valve holds the setting if supply dips.
Bench and pilot-scale process rigs need clean, moisture-reduced air at a stable low pressure. The 40 um filtration and low-pressure regulation in one body keep the rig's pneumatic controls supplied, with the MPa gauge confirming the setpoint.
Size and port step up together: 200 through 600 cover ports from 1/8 to 1 inch, so match the 300 size and its 1/2 in NPT port to the line diameter and the flow your circuit needs. This unit is the L low-pressure type, chosen where the regulated output sits well below standard ranges; its exact adjustment range is not published, so confirm it with us against your setpoint before ordering. The differential-pressure drain is the default and needs no manual attention, while automatic (A) and manual (M) drains are order options. Filtration is the 40 um standard grade; specify W for 5 um where downstream components need finer air. The round gauge here reads in MPa; square embedded gauges and psi or bar scales are alternatives. PT is the catalogue standard thread and G or NPT is ordered as a suffix - this unit carries T for NPT. J means no mounting bracket; omit J for bracket-included versions.
Flow for this family is published as curves, not a single rated figure, so send us your application details and we will confirm sizing from 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 family as curves rather than a single rated number, so we do not quote a rated figure. Tell us your line size and required flow and we will confirm the datasheet curve figures for this 300-size, 1/2 in NPT unit on request.
L marks the low-pressure type of regulator, intended for reduced output-pressure circuits; its exact adjustment range is not published, so confirm it with us against your setpoint. The drain is the differential-pressure type, which discharges condensate automatically as air flows through, with no manual draining required.
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.