The AirTAC GFR300-08 AirTAC Filter Regulator 1/4 in NPT 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 PT1/4" 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 GFR300-08 is an AirTAC GFR-series filter regulator: it removes water and particulate from compressed air and regulates downstream pressure in a single body. This unit is built for 1/4 in NPT ports, carries the standard 40 um filter element, and drains by hand - you open the manual drain when you choose, which suits installations checked as part of a routine. It is the low-pressure type (code L), intended for circuits that run at reduced pressure; the exact adjustment range for this variant is not published, and we confirm it on request. No gauge is fitted (code N), a reverse/check valve is included (code K) to block reverse flow through the unit, and the polycarbonate bowl is mounted using the included bracket.
This is a genuine AirTAC part. The GFR family spans sizes 200, 300, 400 and 600 with ports from 1/8 in to 1 in, PT as the standard thread and G or NPT as order options, plus a choice of manual, automatic or differential-pressure drains, 40 um or 5 um (W) filtration, gauge and scale options, and an optional check valve. Flow is published as curves rather than a single rated figure, so ask us to confirm sizing and any datasheet figure against your application before ordering.
| Model | GFR300-08 AirTAC Filter Regulator 1/4 in NPT Low-Pressure |
|---|---|
| Series | GFR300 filter regulator |
| Port size | PT1/4" (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 | Not fitted |
| 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. |
|---|---|
| 08 | Port size PT1/4". 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. |
| N | No pressure gauge (N). |
| (blank) | Gauge shape: Factory standard. C is round, F is square. |
| (blank) | Gauge scale: Factory standard. 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 · PT1/4" · 40 µm |
|---|---|
| One size down | GFR200 |
| One size up | GFR400 |
| Add lubrication | GFC300-08 (two-unit set) |
A clamping cylinder circuit on a bench or small press needs air that is clean and held at a set reduced pressure. The GFR300-08 filters the supply, regulates it downstream, and the check valve keeps the set pressure from being pushed backward through the unit during line events.
Packaging machines run cylinders and air jets continuously and collect condensate in the bowl. This unit conditions the feed to the sealing heads, and the manual drain lets the operator clear accumulated water during the end-of-shift check that packaging lines already perform.
A robotic pick-and-place module with gripper cylinders needs particulate-free, regulated air to repeat its cycle cleanly. Mounted on the included bracket at the cell drop, this unit conditions the 1/4 in NPT feed, and the low-pressure type suits circuits specified below standard regulator settings.
Start with the port step: size 300 with a 1/4 in NPT port sits in the middle of the GFR range - step up to size 400 or 600, or down to 200, as your line size and air demand require, and match the thread to your piping (PT standard, G or NPT to order). Choose the drain to match how the unit is attended: manual (this unit) for supervised installations, automatic (A) or differential-pressure (blank) where you want drainage without opening the bowl by hand. The 40 um element is the standard grade; specify the W variant if the application needs 5 um filtration. Gauge, scale and bracket options are decodable in the family - this particular unit ships without a gauge and with the bracket included.
Because flow is published as curves and not as a single rated number, we cannot quote a rated flow for this unit. Send us your application details and we will confirm sizing and the exact low-pressure adjustment range 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 series as curves, not as a single rated figure, so we do not quote a rated flow, Cv or SCFM number for this unit. Send us your line size and air demand and we will confirm the sizing against the datasheet curves on request before you order.
The M in the code means the bowl drains by hand: an operator opens it to release accumulated water, which suits installations that are checked on a routine. The GFR family also offers an automatic drain (code A) and a differential-pressure drain (blank) for points you cannot attend regularly - tell us the mounting position and access and we will confirm the right variant.
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.