The AirTAC GFR400-10 AirTAC Filter Regulator PT3/8 Low-Pressure 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 manual drain and regulates 0.05 - 0.9 MPa (7 - 130 psi). It does not lubricate — add a GL lubricator, or order the GFC two-unit set, if downstream equipment needs oil.
The AirTAC GFR400-10 is a filter regulator: one body that removes water and particulate from compressed air and then regulates downstream pressure. This size 400 unit is built around a 3/8 in PT port (PT is the standard thread; G and NPT are order options). The manual drain lets you bleed accumulated condensate from the PC bowl by hand, and the 40 um standard filter element handles typical plant-air particulate. The regulator is the low-pressure type, and this configuration is fitted with an external round gauge scaled in psi; no mounting bracket is included and no reverse/check valve is fitted.
This is a genuine AirTAC part. The GFR family spans sizes 200, 300, 400 and 600, with port sizes from 1/8 in to 1 in, a choice of manual, automatic or differential-pressure drain, a 5 um element option (code W), gauge scale choices, and G or NPT thread variants. Maximum inlet pressure is 1.0 MPa (145 psi) and the working temperature range is -5 to 70 C, non-freezing. Flow is published as curves rather than a single rated figure, so ask us to confirm the datasheet figures for your application.
| Model | GFR400-10 AirTAC Filter Regulator PT3/8 Low-Pressure |
|---|---|
| Series | GFR400 filter regulator |
| Port size | PT3/8" (PT thread) |
| Filtering grade | 40 µm |
| Regulating range | 0.05 - 0.9 MPa (7 - 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 | Manual drain |
| Bowl material | PC |
| Pressure gauge | Fitted — round, psi 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. 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.
| GFR400 | G-series filter regulator, 400 body — sets the port range. |
|---|---|
| 10 | Port size PT3/8". This body offers 10 = PT3/8", 15 = PT1/2". |
| M | Drain: Manual drain — this also sets the regulating band (0.05 - 0.9 MPa (7 - 130 psi)). |
| L | Low-pressure type. Blank is standard, L is the low-pressure type. |
| J | Supplied without bracket. |
| (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. |
| (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 | GFR400 · PT3/8" · 40 µm |
|---|---|
| One size down | GFR300 |
| One size up | GFR600 |
| Add lubrication | GFC400-10 (two-unit set) |
On a production press line, clean, regulated low-pressure air to the clamping cylinders keeps hold-down force consistent part after part. The 40 um element protects the valve stack, the low-pressure regulator sets the clamp circuit pressure, and the psi gauge gives the operator a direct reading at the fixture.
Carton sealers and case packers run air cylinders and vacuum generators continuously. A filter regulator at each machine's air inlet knocks out water and pipe scale before it reaches the solenoid valves, holds a stable working pressure for the sealing heads, and the manual drain suits a machine tended each shift.
Spinning and weaving frames use low-pressure air for thread tensioning and cleaning nozzles. A size 400 filter regulator at the frame's drop keeps lint-laden, wet mill air filtered down to 40 um and the circuit pressure set where the frame's manufacturer specifies, with the round psi gauge readable from the aisle.
Size and port are the first decision: 200/300/400/600 step up in port and flow capacity, and this unit sits at size 400 with a 3/8 in PT port - match the step to your line's air demand. Drain type is a real choice: manual (this unit) suits duty where an operator can bleed the bowl periodically; automatic or differential-pressure drain suits unattended installations. Filter grade is 40 um standard or 5 um (code W) if downstream components need finer protection. Gauge options are the embedded square gauge or an external round gauge, scaled in MPa, psi or bar - this unit carries a round psi gauge. Thread is PT as standard with G (BSPP) and NPT as order options, and brackets can be ordered where panel mounting is needed. One honest note: flow is published as curves, not a single rating, 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. 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 GFR series as performance curves rather than a single rated figure, so we do not quote one number. Send us your line's air demand and working pressure and we will confirm the sizing from the datasheet curves before you order - there is no charge for this check.
The M in GFR40010MLJC2 is the manual drain code: accumulated condensate is emptied from the PC bowl by hand, which suits installations that are checked each shift. If the unit will sit unattended, the same size is available with an automatic drain (code A) or the differential-pressure drain (the default when no drain letter is coded) - just ask for that variant.
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.