The AirTAC GFR30008MJF3WTK AirTAC Filter Regulator NPT1/4, 5 um 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 PT1/4" 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 GFR30008MJF3WTK is an AirTAC GFR300 filter regulator: one body that removes water and particulate from compressed air and sets downstream pressure. This configuration is built on a 1/4 in NPT port with a fine 5 um filter element (code W), a manual drain on the PC bowl, an embedded square gauge scaled in bar, and a reverse/check valve fitted so downstream pressure is held if the supply drops. Maximum inlet pressure is 1.0 MPa (145 psi), the standard regulator covers 0.05-0.9 MPa (7-130 psi), and the operating temperature range is -5 to 70 C (non-freezing).
This is a genuine AirTAC part from the G-series air-treatment line, which spans sizes 200, 300, 400 and 600 with port sizes from 1/8 in to 1 in, a choice of 40 um or 5 um filtration, manual, automatic or differential-pressure drains, and G (BSPP), NPT or PT threads. We confirm flow and other datasheet figures on request, since flow is published as curves rather than a single rating.
| Model | GFR30008MJF3WTK AirTAC Filter Regulator NPT1/4, 5 um |
|---|---|
| Series | GFR300 filter regulator |
| Port size | PT1/4" (NPT thread) |
| Filtering grade | 5 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, 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. 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. |
| 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 · PT1/4" · 5 µm |
|---|---|
| One size down | GFR200 |
| One size up | GFR400 |
| Add lubrication | GFC300-08 (two-unit set) |
Feeding the clamp vise circuit on a CNC machine tool: the 5 um element keeps moisture and swarf-carried grit out of the clamp cylinder, while the regulator holds a steady clamping pressure and the check valve keeps the clamp from releasing if shop air dips.
Conditioning the air feeding grippers and sealing cylinders on a carton or blister packaging line: clean, regulated air at a set pressure keeps cycle behaviour consistent, and the 1/4 in NPT port drops straight into the machine's existing drops.
Supplying bench-mounted pneumatic test rigs and lab apparatus where instruments are sensitive to water and particles: the fine 5 um grade polishes the air, the bar-scale gauge gives a clear set-point readout, and the manual drain suits supervised, intermittent use.
Choose the size and port step against the air your application actually consumes: size 300 with a 1/4 in port suits compact machine supply lines, while larger sizes 400 and 600 carry bigger ports for higher-demand circuits - ask us to confirm sizing from the published flow curves before ordering. This unit already carries the fine 5 um element (the 40 um standard element is available in other codes), a manual drain, a square bar-scale gauge and a check valve; if you would rather not rely on someone draining the bowl, an automatic-drain code is the alternative. Thread is NPT here, with G (BSPP) and PT codes available, and this code omits the mounting bracket.
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 this series as curves rather than a single rated number, so we do not quote a rated flow, Cv or l/min figure. Tell us your application and line pressure and we will confirm the sizing against the datasheet curves on request before you order.
The M in the code means the PC bowl is drained by hand: someone opens the drain when condensate collects. That suits attended machines and intermittent duty. If the unit will run unattended or in humid conditions, pick an automatic-drain (A) or differential-pressure code instead so the bowl empties itself.
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.