Description Manuals Videos Articles Popular Accessories Clemco 21165 - O-ring, 7/8 OD x 5/8 ID FSV Item # 16 Customers Also Viewed Clemco Flat Sand Valve, FSV #02427 $378.55 Gauge Unit for FSV & Sentinel Valves #02433 $35.83 Flat Sand Valve Gasket, Rubber, 2 required #02424 $14.93