The AirTAC GFR30008LC3TK 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 GFR30008LC3TK is an AirTAC GFR300 filter regulator: water and particulate filtration plus pressure regulation combined in a single body, sized for a 1/4 in NPT port. This configuration is the low-pressure type, so the regulating section is built for circuits that run at reduced supply pressure rather than full line pressure. It carries the standard 40 um filter element, a differential-pressure drain in the PC (polycarbonate) bowl that bleeds condensate automatically as flow passes through, a round pressure gauge reading in bar, and a built-in reverse/check valve that holds the downstream circuit if upstream supply is lost. A mounting bracket is included.
This is a genuine AirTAC part. The GFR family is published in sizes 200, 300, 400 and 600 with port options from 1/8 in to 1 in, a choice of differential-pressure, automatic or manual drain, a 5 um element option (code W), embedded square or external round gauges with MPa, psi or bar scales, and PT, G or NPT threads. Flow is published as curves rather than a single rating, so ask us to confirm the datasheet figures for your application.
| Model | GFR30008LC3TK 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 | Fitted — round, 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. 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. |
| (blank) | Pressure gauge fitted (blank). |
| C | Gauge shape: Round. C is round, F is square. |
| 3 | Gauge scale: bar. 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 CNC fixture line, clamping cylinders are held at a reduced, closely set pressure so parts are gripped firmly without distortion. A low-pressure filter regulator at each station cleans the supply, holds the set pressure, and the check valve keeps the clamp from releasing if the main supply dips.
Packaging machines often feed sensitive sub-circuits - vacuum generators, small actuators, glue heads - from a shared header. A compact 1/4 in filter regulator at each sub-panel removes water and pipe scale, drops the pressure to what the sub-circuit needs, and the bar gauge gives operators a visible setpoint.
Test benches and analytical instruments need clean, dry, low-pressure air and must not lose their setting when the shop compressor cycles. This unit filters the bench supply, regulates it down to the instrument's range, and the reverse/check valve holds pressure in the bench line during upstream drops.
Size and port step up together across the GFR range (200/300/400/600, 1/8 in to 1 in), so pick the size whose flow curve covers your demand at the working pressure - we can check the curve against your consumption before you order. Drain choice matters: differential-pressure (this unit) needs no attention during operation, automatic drains on a schedule of their own, and manual drain suits intermittent-duty installations where someone is on site. Filter grade is 40 um as standard; specify the W option for 5 um where downstream equipment needs finer protection. Gauge scale is selectable (MPa, psi or bar) and this unit ships with a round bar gauge. Thread is PT as the catalogue standard with G and NPT as order options - this unit is NPT. Bracket is included; the low-pressure type (L) is the right pick when your circuit runs well below full line pressure.
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 series as curves, not as a single rated figure, so we do not quote a number. Send us your application details - required flow at working pressure, port size, and acceptable pressure drop - and we will confirm the sizing from the datasheet curves before you order.
The L code marks the low-pressure regulator type: the regulating section is built for circuits that operate at reduced supply pressure rather than full line pressure. The K code means a reverse/check valve is fitted, so downstream pressure is held if the upstream supply is interrupted - useful on clamping or holding circuits. The round gauge on this unit reads in bar; MPa and psi scales are also available in the range.
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.