The AirTAC GFR300C08AJNTK AirTAC Filter Regulator NPT1/4 Auto Drain 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 See datasheet 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 GFR300C08AJNTK is a size 300 filter regulator: it removes water and particulate from compressed air and regulates downstream pressure in one body. This configuration has a 1/4 in NPT port, the standard 40 um filter element, and an automatic drain that expels collected condensate without manual attention. The standard regulator covers an adjustment range of 0.15-0.9 MPa (20-130 psi), maximum inlet pressure is 1.0 MPa (145 psi), and the operating temperature range is -5 to 70 C (non-freezing). A reverse/check valve is fitted, no gauge is supplied, and no mounting bracket is included. The polycarbonate bowl suits non-freezing compressed-air duty.
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 can be ordered with manual or differential-pressure drains, a 5 um element (code W), fitted gauges in square or round style with MPa, psi or bar scales, and G (BSPP) or NPT threads in place of the PT standard. Flow is published as curves rather than a single rated figure, so ask us to confirm the datasheet figures for your application.
| Model | GFR300C08AJNTK AirTAC Filter Regulator NPT1/4 Auto Drain |
|---|---|
| Series | GFR300 filter regulator |
| Port size | See datasheet (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 — factory standard, Factory standard scale |
| 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. 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. |
|---|---|
| C0 | Port size See datasheet. 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. |
| (blank) | Mounting bracket included. |
| (blank) | Pressure gauge fitted (blank). |
| (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. |
| (blank) | PT 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 · See datasheet · 40 µm |
|---|---|
| One size down | GFR200 |
| One size up | GFR400 |
| Add lubrication | GFC300-C0 (two-unit set) |
Fitted at the drop feeding a mechanical press's air-operated clamps and counterbalance cylinders, it cleans water and scale from the shop air line and holds a steady set pressure so clamp force stays consistent through the shift. The automatic drain handles condensate without an operator visiting the drop.
Installed ahead of the valve manifold serving servo-weld gun clamps, it filters welding-shop compressed air and regulates supply pressure to the clamp cylinders. The fitted check valve holds the downstream circuit against supply dips, and the 1/4 in NPT port suits compact manifold connections.
Mounted at the line side feeding conveyor diverters, gate cylinders and reject pushers on a bottling filler, it removes moisture that would wash lubricant from seals and regulates pressure so divert timing stays repeatable. The automatic drain suits a line that runs unattended across shifts.
Start with the port and size step: size 300 with a 1/4 in NPT port suits mid-range point-of-use drops, while larger sizes 400 and 600 carry higher flow - match the step to your demand using the published flow curves. Choose the drain to match the duty: this unit's automatic drain suits unattended or hard-to-reach positions, while manual and differential-pressure drains are available where scheduled attention is preferred. The standard 40 um element covers general air prep; specify the 5 um option (code W) where finer filtration is needed. Gauges (square embedded or external round, in MPa, psi or bar scales) and a mounting bracket are order options - this variant has neither fitted. Thread is NPT here; PT is the catalogue standard with G (BSPP) as an alternative. 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. 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 GFR300 series as curves, not as a single rated number, so we do not quote a figure that could mislead your sizing. Send us your application details - required downstream flow and working pressure - and we will confirm the datasheet flow curve and check the fit before you order.
The regulator sets pressure by its adjustment knob, but without a gauge you have no local pressure indication. The GFR family can be ordered with a gauge fitted: an embedded square gauge or an external round gauge, with MPa, psi or bar scales. If you want indication on this unit, ask us for the equivalent GFR300 variant with the gauge code and your preferred scale.
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.