This seal – part # 11726 is a replacement seal for the single lever Fleck bypasses.

Rubber seal to fix fleck stainless steel bypass.

• This seal fits both the brass and stainless steel bypass valves
• It fits both the 3/4″ and 1″ bypass valves
• This valve fits the 5600 series, 2510, 6600, 6700, 9000, 9100, and some other Fleck models.  It fits both the digital and mechanical systems.
•  This is the only replaceable seal and will typically fix all leaks around the bypass handle unless the metal bypass body is damaged in some way
• This seal allows you to fix leaking on the bypass without doing any additional plumbing and without replacing the entire bypass