The AirTAC GFR300-15L AirTAC Filter Regulator NPT1/2 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 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 series combines water and particulate filtration with pressure regulation in a single body, so one 1/2 in (NPT1/2) connection handles both jobs in the air-preparation line. This GFR30015LC3WTK configuration carries the fine 5 um filter element (code W), a differential-pressure drain that bleeds accumulated condensate automatically whenever the pressure differential across the element rises, a low-pressure regulator type, and a fitted reverse/check valve (code K) that holds downstream settings when upstream supply is interrupted. The external round gauge is fitted with a bar scale, and a mounting bracket is included.
This is a genuine AirTAC part. The GFR filter-regulator family spans sizes 200, 300, 400 and 600 with port sizes from 1/8 in to 1 in, a choice of 40 um standard or 5 um fine filtration, differential-pressure, automatic or manual drains, gauge and thread options, and standard or low-pressure regulator types. Flow is published as curves rather than a single rating, so we confirm the datasheet figures for your application on request.
| Model | GFR300-15L AirTAC Filter Regulator NPT1/2 5um Bar Gauge |
|---|---|
| Series | GFR300 filter regulator |
| Port size | PT1/2" (NPT thread) |
| Filtering grade | 5 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, 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. |
|---|---|
| 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. |
| (blank) | Mounting bracket included. |
| (blank) | Pressure gauge fitted (blank). |
| C | Gauge shape: Round. 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 · PT1/2" · 5 µm |
|---|---|
| One size down | GFR200 |
| One size up | GFR400 |
| Add lubrication | GFC300-15 (two-unit set) |
On a stamping or assembly cell with 1/2 in supply drops, this unit filters the shop air to 5 um and holds a stable low-pressure setting at the clamping cylinders, with the check valve preserving the set pressure if the main supply dips.
In a spray booth supply run, the 5 um element keeps moisture and particulates out of the atomising air, while the low-pressure regulator type and bar gauge let the operator set and read the fine delivery pressure the gun circuit needs.
On weaving or carton-sealing machines with 1/2 in air drops, this filter regulator conditions the supply for the machine's air-jet and actuator circuits, and the differential-pressure drain keeps condensate moving out without daily manual attention.
Start with the size and port: size 300 with a 1/2 in port suits lines where the main supply is 1/2 in; step up to size 400/600 or down to 200 depending on the flow your circuit needs, and we will confirm sizing against the published flow curves before you order. Choose the 5 um element (this model, code W) when downstream valves, cylinders or instruments need finer protection than the 40 um standard grade. The differential-pressure drain on this unit needs no operator attention, but if the line runs at low or intermittent flow, ask about automatic or manual drain variants. The low-pressure regulator type is intended for circuits set well below standard ranges; the exact adjustment range is not published, so confirm it with us. The fitted round gauge reads in bar; MPa and psi scales and the embedded square gauge are alternatives. Thread is NPT here, with PT (standard) and G available to order, and the bracket is included.
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 GFR300 series as curves, not as a single rated figure, so we do not quote a number here. Send us your line pressure, set pressure and downstream demand, and we will confirm the sizing from the datasheet curves on request before you order.
The 5 um element (code W) is the fine-filtration option, chosen over the 40 um standard grade when downstream valves, actuators or instruments need cleaner air. The L in the code marks the low-pressure regulator type, intended for circuits set below standard ranges; its exact adjustment range is not published, so confirm it with us. This unit also has a differential-pressure drain, a bar-scale round gauge, a reverse/check valve, NPT threads and an included bracket.
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.