Large Lower Piston Assembly, PN 60103, for the Fleck 2900 and 2930 valves. This is the HWBP ( allows Hard Water By Pass during regeneration cycle ) version. Meaning it allows any water to flow past the valve while the system is in regeneration.
Piston portion is 2 7/8" or 7 cm in length.
NOTE: Many "Commercial" applications require the NHWBP ( No Hard Water By Pass - PN 60104 ) version of this piston to prevent any water getting past the system while it is regeneration.
Lower Seals & Spacers sold separately ( 60128 ).
Top piston is the 60090HF and Seals & Spacers kit 60121.
Related products listing.