The AirTAC GFR300-10 AirTAC Filter Regulator PT3/8 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 regulates downstream pressure in a single 300-size body with a PT3/8 (3/8 in) port. This unit is the low-pressure type, so it is intended for circuits that run at reduced regulated pressure rather than full line pressure. It carries a 40 um standard filter element, a polycarbonate (PC) bowl with a differential-pressure drain that bleeds condensate automatically whenever the pressure differential across the element is sufficient, and an embedded square gauge reading in psi. A reverse (check) valve is fitted, and no mounting bracket is included with this configuration.
This is a genuine AirTAC part. The GFR filter-regulator family spans sizes 200, 300, 400 and 600 with port options from 1/8 in to 1 in, and is offered with a choice of drain type, 40 um or 5 um (W) filtration, gauge scale, thread form (PT standard; G and NPT to order) and bracket. Flow is published by AirTAC as curves rather than a single rated figure, so we confirm the datasheet and flow figures for your application on request.
| Model | GFR300-10 AirTAC Filter Regulator PT3/8 Low-Pressure |
|---|---|
| Series | GFR300 filter regulator |
| Port size | PT3/8" (PT 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 — square, psi 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. |
|---|---|
| 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. |
| (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. |
| (blank) | Filtering grade 40 µm. Only 40 µm (blank) and 5 µm (W) exist. |
| (blank) | PT 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 · PT3/8" · 40 µm |
|---|---|
| One size down | GFR200 |
| One size up | GFR400 |
| Add lubrication | GFC300-10 (two-unit set) |
On finishing and coating lines where spray guns and atomising headers are run at reduced regulated pressure, the low-pressure GFR300-10 filters water and scale from the shop-air supply, holds the set pressure steady at the guns, and its check valve keeps the downstream circuit from back-feeding the header.
Air-jet weaving sheds draw continuously from a compressed-air ring main; a GFR300-10 at each loom group strips condensate and particulate before the jets, regulates the supply to the level the loom controls expect, and the differential-pressure drain keeps the PC bowl clear without daily operator attention.
Carton formers, case sealers and diverters on a packaging conveyor line use cylinders and air actuators that need clean, steadily regulated air; the GFR300-10 conditions the branch feed, its psi gauge gives operators a visible setpoint, and the check valve holds the circuit's air if the upstream supply dips.
Size and port step up together across the GFR range (200/300/400/600), so pick the size whose flow curve covers your machine's air demand at acceptable pressure drop - the 300 size with its 3/8 in PT port sits in the middle of the range. Where a bowl is fitted you choose the drain: differential-pressure (this unit, automatic bleeding with no operator input), fully automatic (A), or manual (M) where you prefer scheduled draining. Filter grade is 40 um standard or 5 um with code W if downstream components need finer protection. Gauge is an embedded square unit as standard (psi scale on this model; MPa or bar scales are orderable) with an optional external round gauge. Thread is PT as standard, with G (BSPP) and NPT as order options, and a bracket can be added if this J-coded, bracket-less configuration needs panel fixing.
Because AirTAC publishes flow only as curves and not as a single rated number, ask us to confirm sizing against your application before ordering.
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 only as performance curves, not as a single rated figure, so we do not quote a flow number for this unit. Tell us your application's air demand and working pressure and we will confirm the sizing against the datasheet curves on request before you order.
K means a reverse (check) valve is fitted, so air flows downstream but cannot flow back toward the supply side. The drain is differential-pressure (blank code): the PC bowl bleeds accumulated condensate automatically when the pressure differential across the 40 um element is sufficient, with no manual draining needed under normal operation.
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.