The AirTAC GFR300-08LNWTK 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 differential-pressure 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 GFR300-08LNWTK is a size-300 filter regulator: it removes water and particulate from compressed air and regulates downstream pressure in a single body. This configuration is the low-pressure type, fitted with a 5 um filter element (the finer of the two published grades), a differential-pressure drain that bleeds collected condensate automatically whenever the pressure differential across the element rises, and an integral reverse/check valve that holds the downstream setting if the upstream supply is lost. It has a 1/4 in NPT port, is rated for a maximum inlet pressure of 1.0 MPa (145 psi), operates from -5 to 70 C (non-freezing), and has a polycarbonate bowl with a mounting bracket included. No gauge is fitted on this variant, so order a gauge separately if a visual pressure indication is needed.
This is a genuine AirTAC part. The GFR family is published in sizes 200, 300, 400 and 600 with 1/8 in to 1 in ports, a choice of differential-pressure, automatic or manual drains, 40 um standard or 5 um (W) elements, standard or low-pressure regulation, gauge options and PT, G or NPT threads. Flow is published as curves rather than a single rated figure, so ask us and we will confirm the datasheet figures for your application before you order.
| Model | GFR300-08LNWTK AirTAC Filter Regulator NPT1/4, 5 um |
|---|---|
| Series | GFR300 filter regulator |
| Port size | PT1/4" (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 | Differential-pressure 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". |
| (blank) | Drain: Differential-pressure 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. |
| 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. |
| 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 directional-control valve manifolds on a carton-forming or wrapping machine, where the low-pressure setting protects the valve train and the 5 um element keeps spool and seal wear down.
Regulating gentle clamp pressures on jig and fixture cylinders that must not mark finished parts, with the check valve holding the clamping setting if shop air dips.
Conditioning the supply to tool-change actuators and air-blast nozzles on a machining centre, where clean, dry, correctly set air keeps the tool changer cycling reliably.
Size 300 with a 1/4 in NPT port suits lines supplied at 1/4 in; if your demand sits near the top of the size-300 flow curve, step up to size 400 rather than oversizing the element. This unit is the low-pressure (L) type, intended for circuits set well below standard regulator ranges - the exact adjustment span for the low-pressure type is not published in our sheet, so confirm it with us against your setpoint before ordering. The 5 um (W) element is the right choice where downstream valves, cylinders or instruments are sensitive to finer particulate; the 40 um standard grade remains available if coarse protection is sufficient. The differential-pressure drain is maintenance-friendly but note it only purges as flow passes the unit - for lines that idle for long periods, an automatic (A) or manual (M) drain variant may suit better. The reverse/check valve is already fitted here. Thread is NPT on this code; PT is the standard and G is also an order option. Flow is published as curves, not a single rating, so send us your application and we will confirm sizing 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 G-series flow as curves, not as a single rated figure, so we do not quote a flow number for this unit. Tell us your application and we will confirm the relevant datasheet flow curve and sizing before you order.
This code carries the N gauge option, so no pressure gauge is fitted - order a gauge separately if you need a visual indication. The L in the code marks the low-pressure regulator type, intended for circuits set below standard ranges; its exact adjustment span is not published in our sheet, so confirm it with us against your setpoint.
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.