Discontinued-See Extended Desc.

This Fleck O-ring, size dash-012, is a discontinued individual part from Pentair that remains available within select service kits. O-rings are the primary sealing elements in any control valve, quietly preventing leaks and internal bypass at fittings, pistons, and connection points throughout the assembly. Though small and inexpensive, a correctly sized, healthy O-ring is absolutely essential to keeping a valve tight, efficient, and free of the slow leaks that can otherwise go unnoticed for weeks.

Why O-Ring Size Matters

Using the correct O-ring size, here a dash-012, is essential for achieving a proper, lasting seal. An O-ring that is too large, too small, or simply worn out can allow drips to form externally or let water bypass internal passages, both of which quietly reduce the valve's efficiency and the quality of the treatment it delivers. Refreshing O-rings during routine service is one of the simplest, most cost-effective ways to keep a control valve sealing tightly and cycling cleanly through every stage of its regeneration sequence.

• Specification: O-ring, size dash-012
• Function: static or dynamic seal within the valve assembly
• Genuine Fleck/Pentair component
• Discontinued as a standalone part
• Available in kits FL18272-0 and FL18272-1
• Helps prevent leaks and internal bypass

To obtain this O-ring, order one of the listed kits, which bundle the seal together with related components for a thorough and convenient repair rather than a partial fix. Confirm your valve model before purchasing so the seal matches your control head and the groove it seats in, and apply a valve-safe silicone lubricant during reassembly to ease installation and protect the new O-ring from nicks. Taking these simple steps helps ensure a smooth, leak-free seal that keeps your water-treatment system performing reliably and efficiently for years to come. Replacing every accessible O-ring in the valve at the same time, rather than just the one that failed, is a common best practice among technicians, since it minimizes repeat teardowns and keeps the whole control head sealing uniformly for the longest possible service interval. A small box of assorted O-rings kept in the toolbox can save a return trip, since the right seal is often the only thing standing between a leaking valve and a finished repair.