The AirTAC GFR300-08 AirTAC Filter Regulator, NPT1/4, Manual Drain 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 AirTAC GFR300-08 is a 300-size filter regulator that removes water and particulate from compressed air and sets downstream pressure in a single body. This configuration carries a 1/4 in NPT port, a manual drain bowl in polycarbonate, a standard 40 um filter element, a square pressure gauge scaled in MPa, and a built-in reverse (check) valve that holds the downstream setting if upstream supply dips. The regulator is the standard type with an adjustment range of 0.05-0.9 MPa (7-130 psi) and a maximum inlet pressure of 1.0 MPa (145 psi).
This is a genuine AirTAC part from the GFR filter-regulator line, which spans 200, 300, 400 and 600 sizes with port options from 1/8 to 1 inch and PT, G or NPT threads. Drain, filter grade, gauge style and scale, bracket and reverse-valve options let you match the unit to the installation. Flow is published as curves rather than a single rating, so ask us to confirm sizing figures from the datasheet for your application.
| Model | GFR300-08 AirTAC Filter Regulator, NPT1/4, Manual Drain |
|---|---|
| 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 | Standard 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, 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. Standard type, regulating 0.05 - 0.9 MPa (7 - 130 psi). 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)). |
| (blank) | Standard type. Blank is standard, L is the low-pressure type. |
| J | Supplied without bracket. |
| (blank) | Pressure gauge fitted (blank). |
| F | Gauge shape: Square. 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 · PT1/4" · 40 µm |
|---|---|
| One size down | GFR200 |
| One size up | GFR400 |
| Add lubrication | GFC300-08 (two-unit set) |
Mounted at the drop feeding clamp cylinders on a machining or assembly fixture, the GFR300-08 cleans water and scale from the shop air line and holds a set clamping pressure; the reverse valve keeps the circuit from bleeding down if the main supply dips mid-cycle.
On a packaging or cartoning line, this unit conditions the air feeding diverters, sealers and pusher cylinders, with the 40 um element catching pipe scale and the manual drain clearing accumulated condensate during shift checks.
Installed inside a machine's pneumatic control panel ahead of valves and air logic, the 1/4 in NPT filter regulator gives each machine its own filtered, regulated supply instead of relying on a shared header setting.
Size and port: the 300 size steps up from the 200 series in both port and flow capacity; pick the size whose published flow curve covers your demand at working pressure, then match the port - here 1/4 in NPT (PT is the standard thread, with G and NPT as order options). Drain: this unit has a manual drain, so plan a routine drain check; choose automatic or differential-pressure drain codes if the installation is unattended. Filter grade: 40 um is standard for general plant air; specify the W code for 5 um where finer protection is needed. Gauge: the embedded square gauge is fitted here with an MPa scale; psi and bar scales and an external round gauge are available. This unit ships without a mounting bracket (J code) and includes a reverse/check valve (K code). Because flow is published as curves rather than a single rated figure, ask us to confirm sizing against your application before ordering.
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 number, so we do not quote a l/min or SCFM figure. Tell us your working pressure and air demand and we will confirm the sizing from the datasheet flow curves on request before you order.
A manual drain means someone opens the bowl drain to release collected condensate, which suits attended installations on a regular maintenance round. If the unit will sit unattended or the air is wet, order the automatic (A) or differential-pressure drain version instead; the regulation range also differs slightly, with manual-drain versions adjusting from 0.05 MPa (7 psi) and auto or differential-drain versions from 0.15 MPa (20 psi), both up to 0.9 MPa (130 psi).
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.