Description Additional Info Product Reviews Milton 684-4BK 1/4" NPT Tank Valve 1/4" MNPT tank valves are designed for use in filling vessels with air. Standard valve core with plastic cap measures at 1 1/2" overall length. Maximum pressure of 200 PSI. Cap thread size of .305-32. UPC: 030937305688 Condition: New Weight: 0.11 LBS