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D. External Air Leaks
1 Attach the regulator first stage to a tank short enough to totally submerge the first and second
stage in your filling station cooling water.
2. With the tank valve still turned off, flood the second stage completely with water, and then
position it mouthpiece up.
3. Turn the tank air valve on
slowly and then watch for any leaks in the first or second stage
(except for the normal flow of air from the one-way bleed valve on the first stage).
4. Repair any leaks.
5. Check for the correct positive air purge flow rate.
See Section 4.4 “Testing of First Stage,” for
the proper method.
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