Refrigeration Technologies-RT100S Big Blu Micro Leak Detector 1 Qt

Refrigeration Technologies Big Blu (RT100S) is hands-down the best leak detector solution on the market. If you need to find a leak in HVAC, refrigeration lines, or anything pressurized, this is the stuff to get. The solution is thick, highly visible, and produces large, long-lasting blue bubbles that instantly pinpoint even the smallest leaks, making diagnosis incredibly fast and easy. What makes this product truly exceptional is its versatility. Beyond my professional use in HVAC work, I successfully used this exact bottle to find tiny, slow leaks in my car tires and even a bike tube! Just brush it on the valve stem and around the tire bead, and the bubbles pop up right where the air is escaping. It’s non-corrosive, safe on all materials, and the included applicator brush is perfect. It works flawlessly every time I use it. This product is an essential item for any technician's toolbox and a great homeowner problem-solver.

Edit: this product leaves an oily residue behind. Oil is the easiest way to detect leaks visually first. Learn how to find leaks without it, and when you need this, it'll save your neck. But, if you're new, and can't find the leak, don't use it and ruin the experienced technician's attempt when he comes in after you. This is a thick solution that will hold on to the sides of vertical pipes. I was a helper for a senior technician out in the field on a brazing call. He charged the system with nitrogen, used some soap and water on a recent braze, found nothing, and I come in with this product. He got a little bent about the fact that I wanted to double-check his work, but he couldn't really say anything when this one found a leak that he couldn't see.

Great A/C leak detection….. Worth buying ….

This leak detection solution is pretty good at finding leaks. The spray bottle it comes in is not good though. I would recommend the solution but maybe get another sprayer for it

If a flea passed gas this stuff would find it! Wonderful at finding those little leaks that might cause you to fail a pressure inspection. But…this stuff causes rust like you would not believe on gas line fittings. Seems like the latest Chinese made fittings are especially rust prone. So use it and remove it. Wash it off and oil the fitting. Or live with ugly rust!

Worked great to find leaks. I had several in my minisplit copper line connections. Helped me find the bad flare jobs. It is a bit messy. Basically seems like dish soap mixed with a bit of water. It has that same consistency. Needed to clean up with an old rsg

No bubbles unless you have a leak. Bubbles when you do. This stuff works great. I did however receive a bottle that had the top unscrewed. The liquid was mostly contained in a plastic bag tied around the bottle, but about a third had escaped. Amazon got a new one on the way immediately. It arrived undamaged.

I love this stuff! It is so good! I wish it came it a smaller size for people doing a DIY mini split install. I used 10 pump's, the rest will go to wast. Sad Face!!!