Flexible stainless steel accordion vacuum tubing featuring welded NW(DN) flanges. While 14113 series Welch CRVpro vacuum pumps include a centering ring with a Viton® o-ring and clamp, one may wish to substitute 12694 series centering ring with a silicone o-ring. For a connection to Ace Glass NW glass flanges, use 12189 series clamp and the appropriate 12197 glass to metal gasket with the desired o-ring material.
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