The AirTAC AirTAC GFR300-10ALJF2WT Filter Regulator NPT3/8 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 PT3/8" 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 GFR300-10ALJF2WT is a 300-size filter regulator that removes water and particulate from compressed air and regulates downstream pressure in a single body. This configuration is fitted with a 5 um filter element (code W) for finer filtration than the standard 40 um grade, an automatic drain that expels collected condensate without manual attention, and an embedded square gauge reading in psi so the set pressure is visible at a glance. The port is 3/8 in with NPT thread, the polycarbonate bowl suits the 300 frame, and the low-pressure regulator type is intended where only modest downstream pressures are required. Maximum inlet pressure is 1.0 MPa (145 psi) and the operating temperature range is -5 to 70 C (non-freezing). No mounting bracket is included with this variant.
This is a genuine AirTAC part. The GFR filter-regulator family is available in sizes 200, 300, 400 and 600 with port sizes from 1/8 in to 1 in, a choice of differential-pressure, automatic or manual drains, 40 um or 5 um filtration, standard or low-pressure regulation, square or round gauges with MPa, psi or bar scales, an optional reverse/check valve, and PT (standard), G or NPT threads. 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 | AirTAC GFR300-10ALJF2WT Filter Regulator NPT3/8 5 um |
|---|---|
| Series | GFR300 filter regulator |
| Port size | PT3/8" (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 | Automatic drain |
| Bowl material | PC |
| Pressure gauge | Fitted — square, psi scale |
| Reflux valve | Not fitted |
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. |
|---|---|
| 10 | Port size PT3/8". 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. |
| J | Supplied without bracket. |
| (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. |
| 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. |
| (blank) | No reverse-flow valve (the default). |
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 · PT3/8" · 5 µm |
|---|---|
| One size down | GFR200 |
| One size up | GFR400 |
| Add lubrication | GFC300-10 (two-unit set) |
Point-of-use conditioning for the pneumatic clamps, tool-change actuators and chip-blowoff lines on a machining centre: the 5 um element protects fine components from water and swarf-laden air while the regulator holds a steady, modest supply pressure at the machine.
Feeding the cylinders and air grippers on a carton-forming or case-packing conveyor, where the automatic drain keeps condensate out of the circuit during continuous shifts and the psi gauge lets technicians set and verify line pressure without tools.
Conditioning the compressed air feeding bench-top test rigs and sample-handling actuators in a lab, where the low-pressure regulator type matches modest working pressures, the 5 um grade keeps air clean for sensitive equipment, and the compact 300 frame fits under the bench.
Choose the size and port step against the air demand of the circuit: this unit is size 300 with a 3/8 in NPT port, one step up from the 1/4 in frame and one below the 1/2 in frame. Drain type is a real decision: the automatic drain fitted here suits unmanned or hard-to-reach installations, while manual and differential-pressure drains are the alternatives on the same frame. The 5 um element (code W) is the finer option over the standard 40 um grade - pick it where downstream valves and cylinders need cleaner air. The square gauge here reads in psi; MPa and bar scales and an external round gauge are the other gauge choices. Thread options are PT (standard), G and NPT - this code specifies NPT as the ordered configuration. Bracket and reverse/check valve options let you tailor mounting and back-flow protection.
One honest note on sizing: AirTAC publishes flow for this family as curves, not as a single rated figure, so we cannot quote a rated flow number. Send us your application details and we will confirm the datasheet and correct sizing on request before you order.
Quick checklist
The PC bowl must not be cleaned with solvents — wipe it with a dry cloth. Without the K option, air cannot flow back through the unit. A filter regulator adds no oil to the line.
AirTAC publishes flow for the GFR family as performance curves rather than a single rated figure, so we do not quote a rated flow number for this unit. Send us your application details and we will confirm the datasheet and check the sizing against your required flow on request before you order.
The A in the code GFR30010ALJF2WT specifies an automatic drain, which expels collected condensate from the bowl without operator attention - useful on unmanned or hard-to-access installations. On the same GFR300 frame you can instead order a manual drain (code M) or the differential-pressure drain (blank), which are the other catalogue drain options.
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.