PN 60131-10 Seals & Spacers KIT has special SILICONE SEAL 2", 2930, 3130, 3150 Valve Lower Seal Spacer Kit.Also the Top part of 3900 Valve uses the Fleck Seals and Spacers kit 60131 also.The -10 is a reference that this has a chemically resistant set of seals made to specifically keep chlorine from swelling the seals, and causing valve failure.
