The AirTAC GFR300-15AC3TK AirTAC Filter Regulator NPT1/2, Round 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 PT1/2" ports, a automatic 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 GFR300-15AC3TK is a 300-size filter regulator that removes water and particulate from compressed air and holds downstream pressure steady in a single body. This configuration is fitted with a 1/2 in NPT port, an automatic drain that expels collected condensate without manual attention, a standard 40 um filter element, a round pressure gauge reading in bar, a reverse/check valve that holds downstream pressure when the supply is lost, and a mounting bracket. Maximum inlet pressure is 1.0 MPa (145 psi), the regulator adjusts from 0.15-0.9 MPa (20-130 psi), and the operating temperature range is -5 to 70 C (non-freezing). The polycarbonate bowl suits standard-duty installations; aluminium alloy bowls are used at size 600.
This is a genuine AirTAC part. The GFR filter-regulator family is available in sizes 200, 300, 400 and 600 with ports from 1/8 in to 1 in, and with choices of drain type, 40 um or 5 um filtration, gauge style and scale, PT/G/NPT thread, and bracket. Flow is published as curves rather than a single rated figure, so we confirm flow and datasheet figures on request before you order. No stock or delivery promise is made here.
| Model | GFR300-15AC3TK AirTAC Filter Regulator NPT1/2, Round Gauge |
|---|---|
| Series | GFR300 filter regulator |
| Port size | PT1/2" (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 | Automatic 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. 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". |
| A | Drain: Automatic 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. |
| (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 · PT1/2" · 40 µm |
|---|---|
| One size down | GFR200 |
| One size up | GFR400 |
| Add lubrication | GFC300-15 (two-unit set) |
Clean, regulated air to the clamping fixtures on a machining centre, with the check valve holding clamp pressure if the shop supply drops mid-cycle.
Feeding carton-sealing and case-erector cylinders on a packaging line, where the automatic drain keeps condensate out of valves without operator attention.
A point-of-use filter regulator at an assembly bench drop, giving each station its own 40 um filtration and bar-referenced setting independent of the main header.
Choose the size and port step against the air demand of the circuit: this unit is size 300 with a 1/2 in NPT port; larger sizes carry larger ports and higher flow capacity, which we confirm against the catalogue curves. Drain type is a real decision: automatic drain (this unit) suits unattended or hard-to-reach installations, manual drain suits supervised points, and differential-pressure drain is the default. Filter grade is 40 um standard; specify 5 um (code W) where finer protection is needed. Gauge options are the embedded square gauge or an external round gauge, with MPa, psi or bar scales - this unit carries a round gauge in bar. Thread is PT as standard with G and NPT as order options; this unit is NPT. A bracket is included, and the reverse/check valve is fitted.
Because flow is published as curves and not a single rating, 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 flow for the GFR series as curves rather than a single rated figure, so no rated flow, Cv or SCFM number is stated here. Send us your air demand and line conditions and we will confirm the correct size and the flow figures from the datasheet on request before you order.
The A in the code sets the automatic drain, which expels collected condensate by itself instead of waiting for a manual bleed - useful at unattended or awkward-to-reach points. The K sets a reverse/check valve, which holds downstream pressure if the upstream supply is interrupted. Both are order choices on the GFR family, along with drain type, 40 um or 5 um filtration, gauge style and scale, and PT/G/NPT thread.
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.