The AirTAC GFR30008LNTK AirTAC Filter Regulator, NPT1/4, 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 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 GFR30008LNTK is an AirTAC GFR-series filter regulator: water and particulate filtration plus downstream pressure regulation in a single body. This 300-size unit is ordered with an NPT1/4 (1/4 in) port, the standard 40 um filter element, and a differential-pressure drain that bleeds collected condensate automatically whenever the pressure differential across the bowl is high enough - no daily manual draining. It is the low-pressure (L) type, intended for circuits regulated to lower pressures, and it carries a built-in reverse/check valve (K) that holds downstream pressure if the upstream supply is lost. No gauge is fitted (code N); a gauge can be ordered separately if you want a visual setpoint reference. Maximum inlet pressure is 1.0 MPa (145 psi) and the working temperature range is -5 to 70 C, non-freezing. The polycarbonate bowl on this 300 size gives a clear view of condensate level.
This is a genuine AirTAC part. The GFR family is published in 200, 300, 400 and 600 sizes with port options from 1/8 in to 1 in, PT as the standard thread and G or NPT as order options, plus manual or automatic drain variants, a 5 um (W) element, gauge choices and a reverse-valve option. Flow for this family is published as curves rather than a single rated figure, so ask us to confirm the datasheet and flow figures for your application before ordering.
| Model | GFR30008LNTK AirTAC Filter Regulator, NPT1/4, Low-Pressure |
|---|---|
| Series | GFR300 filter regulator |
| Port size | PT1/4" (NPT thread) |
| Filtering grade | 40 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. |
| (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) |
On a machining cell where pneumatic clamps and soft-grip fixtures must be held at a reduced line pressure, the GFR30008LNTK filters the shop air and regulates it down in one body, while the built-in check valve holds the clamp circuit if upstream supply drops.
A cartoning or wrapping line running 1/4 in drop legs can use this 300-size filter regulator at each machine: the 40 um element keeps scale and pipe debris out of the directional valves, and the differential-pressure drain keeps condensate off the bowl bottom without operator rounds.
For control panels and pilot-air takeoffs fed from a plant header, this unit cleans the air and regulates a stable low-pressure supply to positioners and pilot valves, with the check valve preventing backflow from the panel into the header during shutdown.
Start with the port step: this unit is 1/4 in NPT. If your line needs more flow than a 300-size body passes, step up to the 400 or 600 size rather than starving the circuit - the honest way to check is to have us confirm the published flow curve against your demand, since AirTAC does not publish a single rated flow number for these units. Next, choose the drain: this configuration uses the differential-pressure drain, which needs no daily attention; a manual-drain (M) version suits intermittent-duty installations, and an automatic drain (A) is available where condensate loads are heavy. The 40 um element fitted here is the standard grade for general plant air; specify the 5 um (W) version only where downstream components need finer protection. The low-pressure (L) type in this code is selected for circuits regulated to lower pressures - confirm the exact regulation range with us before ordering. Note that no gauge is fitted; add one if operators need to see the setpoint. The reverse/check valve (K) is already included, as is the mounting bracket. Thread is NPT on this unit; PT is the catalogue standard and G is also orderable.
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 family as curves, not as a single rated number, so we do not quote a l/min or SCFM figure. Send us your application's flow demand and line pressure and we will confirm the datasheet curve and correct sizing for you before you order.
K means a reverse/check valve is fitted: it blocks backflow and holds downstream pressure if the upstream supply is interrupted. The N code means no pressure gauge is supplied with this unit, so if your operators need to read the regulated setpoint, order a gauge separately and we will advise the compatible option.
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.