Check the listing for details. RT175B Big Blu Microleak Detector; Brush-On, 8 oz. Condition: New. Listed at 20.00 USD. BIG BLU BRUSH ONMICRO LEAK DETECTORThis is our original Big Blu microleak detector downsized into a Brush On applicator. This product is great for spot leak applications and is supplied with a 10 inch extension dauber. NSF certified for use around foodNon-CorrosiveDetects Micro Leaks down to 0.74 oz/yearSafe on any type of gasSIZE: 8OZ WITH EXTENSION DAUBERDirections:Turn off or disconnect all power.Brush all surfaces with a flat liquid free of bubbles or foam.Focus on threaded connections, joints, and valves. Read our “Leak Detection Manual” for more information.Bubbles will form instantly for most leaks. Wait 5-30 minutes. Micro leaks will develop and appear as white foam cocoons or tiny bubble clusters.Place unit back into operation and check for vibration leaks.Wipe or rinse surfaces if water is available.All Done!