The AirTAC GFR300-10 NPT AirTAC Filter Regulator, 3/8 in, 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 PT3/8" 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 GFR300-10 is a filter regulator: it removes water and particulate from compressed air and sets downstream pressure in a single 300-size body. This configuration has a 3/8 in NPT 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, so there is no manual drain routine. It is the low-pressure (L) type, intended for circuits that run at reduced working pressures rather than full line pressure. No gauge is fitted (code N) and no mounting bracket is included (code J), so plan to read the outlet pressure on your own downstream gauge and to mount the unit on the pipework or add a bracket separately.
This is a genuine AirTAC part from the GFR series, which spans sizes 200, 300, 400 and 600 with port sizes from 1/8 in up to 1 in, a choice of differential-pressure, automatic or manual drains, an optional 5 um element (code W), and G or NPT thread options. Maximum working (inlet) pressure is 1.0 MPa (145 psi) and the operating temperature range is -5 to 70 C, non-freezing. Flow figures for this series are published as curves rather than a single rating, so ask us to confirm the datasheet and sizing for your application.
| Model | GFR300-10 NPT AirTAC Filter Regulator, 3/8 in, Low-Pressure |
|---|---|
| Series | GFR300 filter regulator |
| Port size | PT3/8" (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 | 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". |
| (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. |
| J | Supplied without bracket. |
| 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. |
| (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" · 40 µm |
|---|---|
| One size down | GFR200 |
| One size up | GFR400 |
| Add lubrication | GFC300-10 (two-unit set) |
Fitted on the 3/8 in air drop feeding a machining centre's clamping and tool-change circuits, it cleans water and swarf-laden shop air and holds a reduced, stable pressure for the fixture clamps. The low-pressure type suits lines deliberately run below full header pressure.
Installed ahead of the valve manifold on a cartoning or wrapping line, it keeps condensate and particulate out of the directional valves while regulating the supply to the sealing and forming cylinders. The differential-pressure drain handles collected water without operator intervention.
Mounted on the branch line feeding pop-up diverters, stop gates and pushers on a distribution conveyor, it filters the plant air and sets the lower pressure these actuators need for gentle, repeatable operation. The 40 um element protects the small control valves on the gate circuits.
Size and port: the 300 size with a 3/8 in NPT port sits mid-range in the GFR line; step up to 400 or 600, or down to 200, if your line flow demands it - we will confirm the right size against the published flow curves for your application. Drain: this unit uses the differential-pressure drain (the default); choose automatic (A) for continuous unattended condensate removal or manual (M) where you prefer to drain by hand. Filter grade: the standard element is 40 um; specify the W option for a 5 um element where downstream valves and cylinders need finer air. This is the low-pressure (L) type, so confirm its regulation range against your working pressure before ordering. Thread: this version is NPT; PT is the standard catalogue thread and G (BSPP) is also available as an order option. No gauge is fitted and no bracket is included; both can be specified separately. Flow is published as curves, not a single rating, so ask us to check sizing against the application 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 series as curves, not as a single rated figure, so we do not quote a number here - and we will not guess one. Send us your line pressure, working pressure and expected air demand, and we will confirm the flow and sizing from the datasheet for this 300-size, 3/8 in unit before you order.
The N in GFR30010LJNT means no gauge is supplied, so you read the regulated pressure on your own downstream gauge, or order a gauge version of the GFR300 instead. The L means this is the low-pressure type, intended for circuits running at reduced working pressures; its exact regulation range is not published in our sheet, so confirm it with us against your working pressure before ordering.
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.