The UL Listed Test and Drain Valve ( HTD) is a type of valve with both a test function and a quick drain function. An essential product for Fire Sprinkler System. Unique
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2511A - Test and Drain Valve With Pressure Relief
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Inspectors Test & Drain Valve for ZCV Assembly in Urdu/Hindi - YouTube
Test and Drain Straight 1-1/4 in. NPT with 1/2 in. Orifice
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Test & Drain Modules for Fire Protection Systems | Victaulic