The AirTAC GFR300-10 AirTAC Filter Regulator NPT3/8 5um Auto Drain is a genuine G-series filter regulator: water separation, 5 µm particulate filtration and balanced-type pressure regulation combined in a single body. It has PT3/8" 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 GFR300-10 is a 300-size filter regulator that removes water and particulate from compressed air and controls downstream pressure in a single body. This configuration is built for low-pressure service, carries a 5 um filter element for finer particulate capture than the standard 40 um grade, and has an automatic drain that expels collected condensate without manual attention. The fitted round gauge reads in psi, and a reverse/check valve is fitted to hold downstream pressure if the supply drops. Porting is 3/8 in NPT thread, with a mounting bracket included.
This is a genuine AirTAC part. The GFR line runs from size 200 to 600 with port sizes from 1/8 to 1 in, and is offered with manual, automatic or differential-pressure drains, 40 um or 5 um filtration, standard or low-pressure regulation, square or round gauges in MPa, psi or bar scales, and G, NPT or PT threads. Flow is published as curves rather than a single rating, so ask us and we will confirm the datasheet figures for your application.
| Model | GFR300-10 AirTAC Filter Regulator NPT3/8 5um Auto Drain |
|---|---|
| Series | GFR300 filter regulator |
| Port size | PT3/8" (NPT thread) |
| Filtering grade | 5 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 | Automatic drain |
| Bowl material | PC |
| Pressure gauge | Fitted — round, 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". |
| A | Drain: Automatic 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. |
| (blank) | Mounting bracket included. |
| (blank) | Pressure gauge fitted (blank). |
| C | Gauge shape: Round. C is round, F is square. |
| 2 | Gauge scale: psi. 1 is MPa, 2 is psi, 3 is bar. |
| W | Filtering grade 5 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" · 5 µm |
|---|---|
| One size down | GFR200 |
| One size up | GFR400 |
| Add lubrication | GFC300-10 (two-unit set) |
A low-pressure clamp circuit on a CNC fixture needs clean, regulated air at a modest set pressure. The 5 um element protects the clamp valve, the psi gauge gives the operator a direct setpoint readout, and the check valve holds clamp pressure if the main supply dips mid-cycle.
A welding robot's valve manifold and weld-tip actuation cylinders run continuously and cannot tolerate water carryover. The filter regulator conditions the drop feeding the cell, and the automatic drain clears condensate without a technician opening the bowl each shift.
Carton-forming and sealing heads on a packaging line run at low regulated pressures where a standard regulator range is more than needed. This low-pressure GFR300-10 conditions the 3/8 in drop serving the line, with the automatic drain suiting a machine pit that is rarely accessed.
Size 300 with 3/8 in NPT ports sits mid-range in the GFR line; step up to 400 or 600 where the line feeds multiple actuators, or down to 200 for compact single-machine drops. The 5 um element suits air that feeds valves, cylinders or instruments sensitive to fine particulate; the standard 40 um grade is enough for general shop-air protection. The automatic drain suits unattended or hard-to-reach installations; manual and differential-pressure drains are the alternatives on other codes. The low-pressure regulator type is for circuits that set well below standard working pressure - we will confirm the exact adjustment range on request. The round psi gauge is fitted here; square embedded gauges in MPa, psi or bar scales are the other option. NPT thread is this code's specification; G (BSPP) and PT are the catalogue alternatives to order.
Flow for this family is published as curves, not a single rated figure, so please 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 this family as curves rather than a single rated number, so we do not quote a l/min or SCFM figure. Tell us your line demand and working pressure and we will confirm the datasheet curve and check the 300-size 3/8 in unit against your application before you order.
The L in the code marks the low-pressure regulator type, intended for circuits set well below standard working pressure; its exact adjustment range is not published in the catalogue, so we confirm it on request. The A marks an automatic drain, which ejects collected condensate on its own - the right choice where the unit is mounted out of reach or runs unattended.
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.