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This Beck nipple has a weld bead on the inside and is NPT threaded at both ends. Model is interchangeable with black cast iron or steel. For low-pressure plumbing applications including air, water, oil, natural gas, and steam. Certified for use in potable water applications. This listing is for each. Technical Specification Item Nipple Application Air, Gas, Non-Potable Water, Oil, Steam Finish/Coating Black Anodized Fitting Compatibility Schedule 40 Inside Diameter 6 1/16 in Material Steel Material Grade Grade B Maximum Operating Pressure 300 psi @ 150 Degrees F Maximum Steam Pressure 150 psi @ 360 Degrees F Metal Pipe Construction Welded Nominal Pipe Size 6 in Outside Diameter 6 5/8 in Overall Length 9 1/2 in Pipe Weld Type Electric Resistance Weld Schedule Schedule 40 Side A Connection Type Threaded Side A Gender Male Side A Thread Type NPT Side B Connection Type Threaded Side B Gender Male Side B Thread Type NPT Standards ASTM A53 Type E, ASTM A733, Grade B, WWN 351 Thread Configuration Threaded on Both Ends Wall Thickness 0.266 in