Pipe Dies for Machine Die Heads, For Universal Die Heads Nos 504A 711 713 811A 815A 816 817 842, HS SS RH, 14 NPT ORS NASCO 000 operations indicating a service 000 operations indicating a service life of 10 to 12 years of comparable use Non interchangeable oxygen and fuel gas connectors prevent accidental gas mixing Instant closure on reverse flow check valves with total shutoff at only 10 oz of back pressure All steel bar clamp with standard swivel pad Heat treated Strong and durable pipe dies for use in universal die heads Applicable to a wide variety of die heads A convenient replacement to keep systems functioning for longer