The AirTAC GFR300-10 AirTAC Filter Regulator, NPT 3/8 in, psi Gauge 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 GFR300-10 is an AirTAC GFR-series filter regulator: filtration and pressure regulation combined in a single body. This 300-size unit is specified with a 3/8 in NPT port, a 40 um standard filter element for water and particulate removal, and a differential-pressure drain that bleeds collected condensate automatically as the pressure differential across the bowl changes. The square pressure gauge is embedded in the body and reads in psi, and a reverse/check valve is fitted so downstream pressure is held if the supply is interrupted. Maximum inlet pressure is 1.0 MPa (145 psi), the regulator set range is 0.15-0.9 MPa (20-130 psi), and the operating temperature range is -5 to 70 C (non-freezing). The polycarbonate bowl suits this 300 size.
This is a genuine AirTAC part. The GFR family is available in sizes 200, 300, 400 and 600 with port sizes from 1/8 in to 1 in, and with choices of drain type, 40 um or 5 um filtration, gauge scale, thread (PT standard, G and NPT as order options), bracket and check valve. Rated flow for this series is published as curves rather than a single figure, so ask us to confirm the datasheet figures for your application before ordering.
| Model | GFR300-10 AirTAC Filter Regulator, NPT 3/8 in, psi Gauge |
|---|---|
| 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 | Standard 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. Standard type, regulating 0.15 - 0.9 MPa (20 - 130 psi). 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)). |
| (blank) | Standard 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. |
| 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 · PT3/8" · 40 µm |
|---|---|
| One size down | GFR200 |
| One size up | GFR400 |
| Add lubrication | GFC300-10 (two-unit set) |
Feeds filtered, regulated air to the tool-clamp and chip-clearing circuits of a CNC machining centre, with the check valve holding the clamp setting if shop air drops.
Supplies clean, pressure-set air to the diverting and sealing cylinders on a carton packaging line, where the 40 um element protects valve spools from water and debris.
Regulates supply pressure to impact drivers and air ratchets at an automotive assembly bench, with the psi gauge letting operators verify the set point at a glance.
Start with the port and size step: this 300-size unit takes a 3/8 in NPT connection, and the GFR range steps through 200, 300, 400 and 600 as port size and flow capacity rise - match the step to the air demand of the circuit rather than oversizing on guesswork. Other decodable choices for this family are the drain (differential-pressure as here, automatic, or manual), the filter grade (40 um standard, 5 um with code W for finer particulate), the gauge (embedded square as standard here in psi, external round optional, scales MPa/psi/bar), the thread (PT is the standard; G and NPT are ordered as options), and the bracket (J means no bracket is supplied with this unit). Flow for the series is published as curves, not a single rating, so send us your flow and pressure requirements and we will confirm sizing against 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 flow for the GFR series as performance curves rather than a single rated figure, so we do not quote a number here. Tell us your required flow and working pressure and we will confirm the datasheet figures for this 3/8 in unit before you order.
K means a reverse/check valve is fitted, so downstream pressure is retained if the upstream supply is lost. This unit has no drain-code letter, which is the differential-pressure drain: condensate collected in the bowl is expelled automatically as the pressure differential changes, with no manual draining routine required.
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.