A 150-mm glass-tube unit with Ak-in (3-mm) threaded connection, 316 stainless steel frame, and 16-turn high-precision valve is $260; the same with aluminum frame and standard valve is $100. Adding a differential pressure regulator of brass or aluminum construction costs about $150 (of stainless steel, about $500). For highly corrosive services, all-Teflon, all-PTFE, all-PFA, and all-CTFA units are available which, when provided with valves, cost $550 with f-in (6-mm) and $1300 with df-in (19-mm) connections.

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