Gas-leak tester Roth, special liquid pump spray bottleSpecial liquid for finding smallest leaks in tubing or hollow spaces that are under gas or air pressure. Nontoxic, non-inflammable, non-corrosive. Suitable for compressed air, butane, natural gas, town gas, propane, CO2, O2, N2, H2 and ammonia. Spray possible leakage area. Bubbles appear at site of leak.