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All diaphragm packless valves contain metal diaphragms and backseat metal to metal when the valve is fully open. Controlled stem travel assures lifetime diaphragm performance.
All OD solder connections for valves 7/8" and smaller are machined to an outside diameter equivalent to the next largest standard size of tubing.
Superior diaphragm packless valves can be soldered into the line without disassembly.