Can I use the AI303-R1 for spray painting?

Yes. The AI303-R1 is widely used by auto painters and refinishers. The filter removes moisture and oil that cause fisheye defects, and the built-in gauge lets you set the precise PSI your spray gun needs — typically 25 to 50 PSI at the gun for HVLP.

AI303-R1 air compressor filter regulator water oil separator - front view showing full product design

AI303-R1 air compressor filter regulator water oil separator - detailed angle view of key features

AI303-R1 air compressor filter regulator water oil separator - close-up of connection points and fittings

AI303-R1 air compressor filter regulator water oil separator - product specifications and dimensions view

AI303-R1 air compressor filter regulator water oil separator - product installed in workshop application

Professional 2-in-1 Air Compressor Regulator & Filter - 140 PSI Aluminum Water/Oil Separator with Gauge (AI303-R1)

Name: Professional 2-in-1 Air Compressor Regulator & Filter - 140 PSI Aluminum Water/Oil Separator with Gauge (AI303-R1)
Brand: LE LEMATEC
SKU: BX-3XLL-V13R
Price: 23.89 USD
Availability: InStock
Rating: 4.53 (111 reviews)

$23.89

🛡️ 12-month satisfaction guarantee 🚚 Free US shipping 📦 Arrives in 3–5 business days★ 4.53/5 (111 reviews)

Product variants

FREE shipping on every order No minimum · ships free anywhere in the US

In Stock — Arrives in 3–5 business days Free shipping on every order.

🏭 Factory-direct from LE LEMATEC — manufacturer pricing, no retail markup.

🔒 Secure checkout · 🔄 12-month satisfaction guarantee

What buyers say

Verified by Judge.me

★★★★★

Peanut VilartesVerified

Great value air filter

Great value air filter. Perfect for professional and hobby use. I am an autobody painter.

★★★★★

JonathanVerified

Number 1 purchase

This regulator/filter was probably the #1 purchase for the last truck I sprayed.

Read all reviews →

📚 Helpful guides
CFM & PSI requirements by tool · Fittings compatibility guide

2-in-1 filter + regulator — moisture trap and pressure control in a single 1/4" NPT unit.

140 PSI max48 SCFM flow5-micron reusable elementAluminum body, PC bowl1/4" NPT

✔ Out of stock? The separate pair covers the same job: inline filter + analog regulator · 🛡️ 12-month guarantee

Free shipping on every order

12-Month Satisfaction Guarantee — replacement, exchange or refund.

Sku: BX-3XLL-V13R
Available: instock
Vendor: LE LEMATEC
Type: Air Filter Regulator
Collections: Filters , Regulators , Top Selling

LE LEMATEC

Professional 2-in-1 Air Compressor Regulator & Filter - 140 PSI Aluminum Water/Oil Separator with Gauge (AI303-R1)

$23.89

Description

Quick Facts

140 PSI / 10 Bar1/4" NPTAluminum body5-micron filterBuilt-in gaugeLe Lematec

Best for: Compact air preparation in home garages and small shops. One unit combines pressure regulation, water-oil filtration, and a gauge — replaces three separate components.

The Le Lematec AI303-R1 combines a precision pressure regulator and a 5-micron oil-water separator in one compact aluminum housing. Rated to 140 PSI with 1/4" NPT connections and a built-in analog gauge, it delivers clean, regulated air to HVLP spray guns, plasma cutters, impact wrenches, and any pneumatic tool that depends on dry, pressure-stable air.

Compatible With

Air compressors	Any compressor up to 140 PSI with a standard 1/4" NPT outlet
Air tools	HVLP spray guns, plasma cutters, impact wrenches, ratchets, sanders, nailers
Air lines	Standard 1/4" NPT air hoses, quick-connect couplers, manifolds
Mounting	Wall, pipe, or compressor outlet — best installed at the point of use to catch in-line condensate

What’s in the Box

AI303-R1 filter regulator combo unit
Analog pressure gauge (pre-installed)
Aluminum filter bowl with 5-micron element
Push-button drain valve
1/4" NPT inlet/outlet fittings
Mounting bracket
User manual

Key Features

Two-stage air conditioning: 5-micron filter element removes water, oil mist, and particulates; integrated regulator dials in working pressure.
Built-in analog gauge: Monitor regulated output PSI at a glance — no separate gauge or tee required.
140 PSI / 10 Bar rated: Handles the output of single- and two-stage compressors typical of home and pro shops.
Aluminum construction: Lightweight, corrosion-resistant, and longer-lived than plastic filter bowls.
Push-button drain: Quick contaminant removal without tools — empty the bowl in seconds between jobs.
1/4" NPT universal fit: Drops into any standard pneumatic system.

Technical Specifications

Maximum pressure	140 PSI / 10 Bar
Maximum flow	48 SCFM @ 140 PSI
Filter element	5-micron, reusable
Connection	1/4" NPT (male/female)
Housing	Aluminum body, polycarbonate bowl
Best applications	HVLP spray, plasma cutting, general workshop air

Common Questions

Do I need a separate filter if I have the AI303-R1?

No. The AI303-R1 combines filtration and regulation in one unit. The 5-micron element removes water, oil mist, and particulates. For ultra-clean air on spray painting or plasma cutting, add a desiccant dryer downstream — but for typical air tools, this unit is the only conditioning stage you need.

What air compressor do I need to drive it?

Any compressor with a 1/4" NPT outlet rated up to 140 PSI. The regulator handles up to 48 SCFM at maximum pressure, which exceeds the demand of every common single-tool operation. For high-demand tools (sandblasters, large sanders), mount the unit close to the tool to minimize pressure drop.

Can I use this for spray painting?

Yes. The AI303-R1 is widely used by auto painters and refinishers. The filter removes moisture and oil that cause fisheye defects, and the gauge lets you dial in the precise PSI your spray gun needs — typically 25–50 PSI at the gun for HVLP.

Can I wall-mount it?

Yes. The included bracket supports wall or pipe mounting. Mount at the point of use rather than at the compressor — that placement catches the condensate that forms in the air line between compressor and tool.

How do I drain the bowl?

Push the drain valve at the bottom of the bowl. Collected water and oil discharge in seconds. Drain after each session, or daily if the compressor runs heavily — a full bowl will start passing moisture downstream.

When should I choose the AI303-R1 over the AI303-C1 or AI-304?

The AI303-R1 is the only unit in this lineup with an integrated pressure regulator and gauge — choose it when you need to dial in a specific PSI at the tool. Pick the AI303-C1 (1/4" NPT, 150 PSI, filter-only) if you already have a separate regulator. Pick the AI-304 (1/4" NPT, 200 PSI, slim inline filter) when you need the highest-pressure, lowest-profile filtration without regulation.

Related Guides

Customer Reviews

This 2-in-1 regulator and filter effectively removes moisture and contaminants while maintaining stable pressure for spray painting. Customers praised its "solid aluminum construction" and compact design. However, some reported issues with pressure regulation inconsistency, air leaks, and drain valve failures. A few noted it works better as a volume restrictor than a true pressure regulator.

Excellent product. My paint finish improved noticeably.
Quality construction. Aluminum body feels solid.
Gives me peace of mind for clean paint jobs. Prevents fish eyes.

Quality (positive)Paint (positive)Filter (positive)Gauge (positive)Moisture (positive)

5 stars: 85 (77%)
4 stars: 13 (12%)
3 stars: 3 (3%)
2 stars: 7 (6%)
1 star: 3 (3%)

quality

Haven't used it yet but it looks like it's good quality

Works great!

Works great and as expected! I especially like the ability to purge the moisture as I live in a very humid climate.

Working great!

Working great ! Sand blasting rusty vintage crosses and other things around house. This is keeping out all the moisture in this humid environment .

1/8" inside, cheater valve, not a regulator.

Update, long gone.I use a bucket full of ice for 50' of hose, then a motor guard separator and filter, it's the only way I can keep vapour out of my lines. For disposables, look at motor guard inline units, they're orange and work great but can break too.This has been a good HVLP filter/separator, the air flow restrictor (regulator) does not respond as fast as a diaphragm regulator, and impedes CFM. I recommend a good regulator, and a lone filter/separator. As you can see, it has an 1/8" internal air passage. I was having to set my compressor at 75 psi to achieve 25psi at the sprayer. Maybe for air brush.

Beware, could injure!

First day of use - I usually use those cheap $5 plastic Harbor Freight filters and never had an issue like this. I figured I'd try a more expensive one, all metal that takes a higher max psi of 150. I was running at 90 psi when without warning the entire unit blew up in my face. Luckily I had eye protection on. Could have easily Injured someone. Do not buy!

It came

false

Great amazing

👍🏾👍🏾

No more contaminants

Small and compact. Easy to install. Took care of all my contaminants that were in my paint definitely will buy again

Worked perfectly

This was 100% needed for controlling air to my paint guns. Worked so well I got one for each paint gun.

Love using it

I just received this it's heavier than I originally thought but it works very well it allows me to control the PSI better than anything else I've tried so far

Works great

Works great easy to adjust the gauge and filter combo is great!

Great regulator and gauge

Le Lematic regulator with gauge and separator are a perfect fit. Worked perfect with my detail sprayer.Great Product!!!

Great product

Perfect fit

Regulator great ess

I own a wood shop. Bought this one, mainly further sift water while spraying. No bubbles, even spray, good volume. Highly recommend.?

Excellent product

Excellent product. My paint finish improved noticeably.

Good unit

Good unit for the money. Works as advertised.

Quality construction

Quality construction. Aluminum body feels solid.

Great for beginners

Great for beginners getting into spray painting.

Essential for spray work

Essential for spray work. Keeps air clean and dry.

Solid combo unit

Solid combo unit. Does both filtering and regulating well.

Clean paint jobs

Gives me peace of mind for clean paint jobs. Prevents fish eyes.

Great value air filter

Great value air filter. Perfect for professional and hobby use. I am an autobody painter.

Number 1 purchase

This regulator/filter was probably the #1 purchase for the last truck I sprayed.

Worked well

Worked well, kept the pressure even. Like the way you could adjust the gauge.

Product value

Great product

Good

Perfect

Works Well

Works exactly as intended, catches fluid before it reaches tools. No leaks, seems to regulate pressure properly.

Compact, high quality

Great pressure regulator, connected to spray gun to paint kitchen cabinets

Shipping Policy

Shipping Information

Free shipping on every US order, with no minimum.
Most orders arrive within 3–5 business days.
Items marked factory-direct ship from the Le Lematec factory and arrive in 10–15 business days; an express upgrade to 3–5 business days is available at checkout.

Refund/Return Policies

Product Return/Refund and Exchange Policies

At Pro Air Tools, we ensure that we are providing the best quality products from the most trusted hand tool brand. Thus, we stand behind all of our products and quality control 100%.

In the event that the products you ordered from us did not meet your expectations, we will gladly offer you our 12-Month Satisfaction Guarantee — replacement, exchange or refund, with no restocking fee.

If within 12 months from your purchase, you are not fully satisfied with any of the products, you may request any of the following:

Product Replacement
Exchange the product with another product of the same value.
Refund the amount you paid.

Proof of purchase from Pro Air Tools is required for all return, refund, and exchange requests. We also require anyone who wishes to return a product, or request a refund, to fill out our Return/Refund Form. We will notify you via email or phone once we process your return/refund request. Refunds will be credited to the original payment method.

With regards to product exchanges, please note that we only accept this type of request if the product delivered to you is defective or damaged. If a customer opts to request a product exchange with “change of mind” as the reason, the product must be returned in its original packaging. The product should not be used or installed in any manner. All return shipping costs will be shouldered by the customer. Return unused product to our office address at 103 Edwin Pl. Asheville, N.C. 28801.

If you have any question regarding our return/refund and exchange policy that was not answered here, feel free to reach out to us via:

Email at sales@proairtools.com

A phone call at +1 828 398 0334

PO Box 8367
725 MERRIMON AVE
ASHEVILLE, NC 28804-2447

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