Special Piston ( NHWBP ) version for 1500, 2500, 2510 and 2750 when multiple tanks ( alternating ) installation = PN 60101-01Used when No Water is allowed to pass the valve during the backwash / regeneration process.The NHWBP ( no hard water by pass ) version is only used with multiple resin tanks and when more than one valve is configured into a System.This is a replacement piston. If you need to "convert" a valve to No Hard Water, that is KIT PN 60101-02 ( about $ 40.00 extra ).OR "Filter" version ( not softener ) is PN 60101-00 ( about $ 40.00 extra ).* Special Order *NOTE: Not a stock item. Don't be fooled by websites that say they stock these, as no one does ( not even the largest OEMs ). We have to order this ( and most other SPECIAL ORDER items direct from Fleck / Pentair Water ). Please allow 4 week lead time when ordering. What is commonly used is the Piston Assembly PN 60090-HF, which does allow hard water to flow through the valve while the valve is in the regeneration process.
