Brass Check Valve P/N 249B-4PP-8 Size 1/2" THREAD DIRECTION ......................RIGHT-HAND FLOW CONTROL DEVICE ...................POPPET DISK LOADING METHOD ...................SPRING MAXIMUM OPERATING TEMP ................400.0 DEG FAHRENHEIT CONNECTION STYLE ......................B9 PLAIN VALVE OPERATION METHOD ................AUTOMATIC CONNECTION TYPE .......................THREADED INTERNAL PIPE MOUNTING POSITION .....................HORIZONTAL OR VERTICAL MAXIMUM OPERATING PRESSURE ............3000.0 POUNDS PER SQUARE INCH NOMINAL THREAD SIZE ...................0.500 INCHES OPENING PRESSURE SETTING ..............8.0 POUNDS PER SQUARE INCH SPECIAL FEATURES ......................LG 2.712 IN MATERIAL ..............................COPPER ALLOY MEDIA FOR WHICH DESIGNED ..............AIR ACETYLENE AMMONIA, GASEOUS CARBON DIOXIDE STYLE DESIGNATOR ......................A6 STRAIGHT THRU THREAD SERIES DESIGNATOR ..............NPT DEFINITION: A VALVE PERMITTING FLOW IN ONE DIRECTION ONLY. IT DOES NOT HAVE A STEM, EXCEPT WHEN EQUIPPED WITH A LEVER AND WEIGHT AND HAS NO PRESSURE ADJUSTMENT. IT MAY BE INLINE OR CARTRIDGE (MANIFOLD) DESIGN.