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🔥 Flux that flows clean, safe, and strong—because your pipes deserve the best! 💧
The LA-CO 22194 Copper Flux Paste is a 4 oz, water-soluble, non-toxic soldering aid designed for copper and brass plumbing. It meets ASTM B813 and NSF-61 standards, ensuring safe use in potable water systems. Its all-weather formula works in extreme temperatures, while the brush-in cap allows precise application. Lead-free and non-acidic, it cleans pipes during soldering for smooth, corrosion-free joints.

| Customer Reviews | 4.7 out of 5 stars 1,078 Reviews |
A**E
As advertised. Works good.
I see some stating that you cannot use this on Electronics. Well. I looked up the La-Co 22194 spec sheet from the company. It is NON toxic listed as suitable for BS6920 UK Water fittings. Listed for use with lead free and all soft solders. Do not use with Aluminum Stainless Steel or Silver type soldering. And its Non Acidic. -Non toxic -Non acidic -Water soluble So long and short. Copper is copper. This works great for electronics. Tested on a SATA PCIe card and boy it helps on the small SMD's and yes it is WITH leaded solder. Once done. Clean with alcohol to remove flux mess. (I would not leave it on the part I am working on) This stuff works. You get a lot. And you save money. You can look this up on Markel homepage. It is made in the USA part number 22194 and at the time I bought it I gave $4.64 for a plastic jar the size of Vienna sausage can. Edit: To the person that said its conductive. Yes it is conductive. But....most all flux IS conductive. Proper clean up on some types is essential.
M**N
It worked
Worked great on my vintage Benjamin air rifle barrel,good as new,great product for sure.
M**S
Perfect for beginners learning soldering
My husband and son needed flux for soldering as they’re learning and practicing. This was just what they needed — good quality and a great price.
J**A
Received as advertised and as scheduled
Received as advertised and as scheduled
G**I
Great flux! Brush in cap!
This product works well! I've been using non stop since I received it! It cleans up well with water after soldering! I like much better than the previous flux which was greasy to clean up! Love the brush in cap! You can see it working as soon as applying! The copper starts to turn bright!
Q**,
Buen producto
Muy buena, ayuda a distribuir muy bien la soldadura
S**1
The best flux around!
This is hard to find locally, if at all. Easy to get on Amazon . It is the best flux that I have found in 50 years of sweating copper pipes.
J**L
Very good purchase excellent product
Very good purchase excellent product
S**.
Genial para estañar
Lo uso para estañar y va de maravilla
Trustpilot
3 weeks ago
1 week ago