Pentair Wellmate Well Mate Air Cell/Bladder Replacement Kit Wm-6 Wm-9 Wm-12 Wm-14wb Wm-20wb Wm23 Wm-25wb Wm-35wb (WM-9 / WM0120 PEU CH3134-2) Genuine WELLMATE brand BUTY AIR CELL REPLACEMENT KIT INCLUDES INSTRUCTIONS, O-RINGS,WASHERS AND AIR CELL COMPATIBLE WITH QUICK CONNECT AND OR CLASSIC MODEL WORKS ONLY WITH NEWER "GRAY" COLORED TANKS ( NOT YELLOW) BRAND NEW IN FACTORY SEALED BOX... SHIPS FAST!