The AirTAC GFR300-15 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 automatic 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 GFR300-15 is a filter regulator: it removes water and particulate from compressed air and regulates downstream pressure in a single body, so one 1/2-inch (NPT1/2) unit does the job of a filter and a regulator in the line. This configuration is the size 300 low-pressure type with an automatic drain, so collected condensate is discharged without manual attention, and a 40 um standard filter element. It is fitted with an embedded square gauge reading in psi and a reverse (check) valve, and a mounting bracket is included.
This is a genuine AirTAC part. The GFR series is offered in sizes 200, 300, 400 and 600 with a choice of ports, PT, G or NPT threads, differential-pressure, automatic or manual drains, a 40 um standard or 5 um (W) filter element, standard or low-pressure regulation, gauge scale options and an optional reverse valve. Flow is published as curves rather than a single rating, so ask us to confirm the datasheet and sizing figures for your application on request.
| Model | GFR300-15 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 | Automatic drain |
| Bowl material | PC |
| Pressure gauge | Fitted — square, psi 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". |
| A | Drain: Automatic 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). |
| 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. |
| 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 line, the GFR300-15 cleans the shop air of water and chips-scale particulate and holds a steady low regulated pressure to the clamp cylinders, with the psi gauge giving the operator a direct readout at the cell.
Feeding cylinders and air jets on a cartoner or case packer, this filter regulator keeps condensate out of the valve manifold and the low-pressure type regulation matched to the machine's supply requirement, while the automatic drain handles moisture without daily attention.
At a 1/2-inch service drop on a textile or process line, the unit filters the plant air, regulates it down for the machine circuit, and the built-in check valve holds the downstream setting against supply-side dips.
Start with the port step: size 300 with a 1/2-inch port sits mid-range in the GFR line, so step up to size 400 or 600 if your line needs more flow, or down to 200 for compact circuits - and ask us to confirm the flow curves against your demand before ordering, since flow is published as curves, not a single rating. This unit is the low-pressure type, chosen where the regulated pressure sits below what a standard regulator is set up for; the exact adjustment range for the low-pressure type is not published, so confirm it with us. The automatic drain suits unattended duty; choose manual if you prefer controlled discharge, or the differential-pressure default. The 40 um element is the standard grade; specify W for the 5 um option. The square gauge here reads psi; MPa and bar scales are available. PT is the standard thread, with G and NPT as order options - this unit is the NPT version. A bracket is included; a reverse valve is fitted.
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 series as curves, not as a single rated figure, so we do not quote a number here - and we will not estimate one. Tell us your line demand and operating pressure and we will confirm the sizing against the datasheet curves on request before you order.
The L in the code marks the low-pressure regulator type, intended for applications where the regulated pressure sits below the standard type's usual range; the exact adjustment range for the low-pressure type is not published, so confirm it with us. The K code means a reverse (check) valve is fitted, which holds the downstream setting if upstream supply drops. This unit also carries an automatic drain, a 40 um element and a square psi gauge.
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.