The AirTAC GFR300-15 AirTAC Filter Regulator PT1/2 Square Gauge psi 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 PT1/2" 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 GFR300-15 is a filter regulator: one body that removes water and particulate from compressed air and then regulates downstream pressure. This 300-size unit is fitted with a PT1/2 (1/2 in) PT-threaded port, a 40 um standard filter element and a differential-pressure drain that bleeds collected condensate automatically whenever the pressure differential across the bowl is high enough, so no manual draining routine is needed. The regulator covers 0.15-0.9 MPa (20-130 psi) and carries an embedded square gauge scaled in psi, plus a built-in reverse (check) valve that keeps the set pressure from backing out through the inlet when upstream supply is lost. The polycarbonate bowl suits this size, and the unit ships without a mounting bracket.
This is a genuine AirTAC part. The GFR series is available in sizes 200, 300, 400 and 600 with port options from 1/8 in to 1 in, PT standard thread with G (BSPP) and NPT as order options, manual or automatic drain variants, a 5 um element (code W), gauge scale choices and low-pressure types. Flow is published as curves rather than a single rated figure, so ask us and we will confirm the datasheet figures for your application on request.
| Model | GFR300-15 AirTAC Filter Regulator PT1/2 Square Gauge psi |
|---|---|
| Series | GFR300 filter regulator |
| Port size | PT1/2" (PT 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. |
|---|---|
| 15 | Port size PT1/2". 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. |
| (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 · PT1/2" · 40 µm |
|---|---|
| One size down | GFR200 |
| One size up | GFR400 |
| Add lubrication | GFC300-15 (two-unit set) |
Cleaning and regulating the shop-air feed that powers tool changers, clamps and air-blast nozzles on a machining centre, with the check valve holding the set pressure if the main supply dips.
Conditioning the air feeding carton-forming and case-sealing cylinders on a packaging conveyor, where the differential drain copes with condensate from a long compressed-air run.
Filtering water and pipe scale out of the air feeding spray guns and air-assisted applicators in a finishing booth, so the regulator holds a steady set pressure at the gun.
Size the GFR series by stepping up through 200, 300, 400 and 600 as your required flow and port size grow; this 300 size with PT1/2 suits mid-range supply lines. Choose the drain to match maintenance reality: differential-pressure (this unit) drains itself on pressure swings, automatic (A) drains on a timer-free float principle, and manual (M) needs someone to open the drain. Pick the 40 um standard element for general plant air or the 5 um W option where finer filtration is wanted; select the gauge scale you read in (MPa, psi or bar) and PT, G or NPT thread to match your piping. This configuration has no mounting bracket (code J), so plan a rigid connection or add a bracket variant if you need panel fixing. Because flow is published as curves and not a single rating, send us your application details 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 GFR performance as flow curves rather than a single rated figure, so we do not quote one number. Tell us your line pressure, set pressure and expected air demand, and we will confirm the flow from the datasheet for this exact 300-size, 1/2 in configuration on request.
K means a reverse (check) valve is fitted. It prevents downstream air from flowing back out through the regulator inlet, so the set pressure is held if the upstream supply is shut off or drops. This unit also carries the square gauge in psi (F2), a 40 um element, differential-pressure drain and PT thread as its other decoded options.
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.