Nokorode water-flushable flux 4 oz. Meets a. This is manufactured in United States. Conforms to ASTM B-813 specifications. Will not run or drip during application. Superior wetting ability-allows solder to flow easily and uniformly into joints. Water washable.
I really like this flux. I used it the other day when I was rerouting some old plumbing, even reused some fittings and this flux flowed perfectly over the solder.
This is my flux. I love that it doesn't immediately liquify and drip off the copper pipe once you heat it like another big brand does. It's hard to solder when the flux is gone! It becomes liquid just before it gets hot enough to melt the solder.