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Harris Two Stage Ultra High Purity Brass Barstock Regulator Model 721C-500-580-HP - 721C500580HP Collet Ready-Pak 1 option includes theHarris Two Stage Ultra High Purity Brass Barstock Regulator Model 721C 500 580 HP 721C500580HP Features 1 11 16" 316L Stainless Steel diaphragm eliminates contamination from diffusion or outgassing One piece encapsulated seat design with 10 micron sintered internal filter to protect the PTFE Teflon seat from particulate contamination External relief valve is standard Brass Barstock body, bonnet and fittings 2 dual scale Brass Barstock gauges (psi bar)