Safety is always priority when working with torches! Apply this fluid every time you change your torch, hook up a new tank or torch, or simply when you want to check for any leaks that may have formed in any of the connections. Should a leak be present. the liquid will bubble within seconds of application alerting you of a leak. Contains 8 fl. oz. Please Note: CAUTION! Do not use standard soap solutions to test for leaks; these solutions may contain combustible ingredients. Made in USA.