Ambient Weather F007PF-MAINTENACE Maintenance Kit for F007PF Floating Pool and Spa Thermometer This kit provides the tools, materials and parts necessary for performing maintenance on the F007PF floating pool and spa thermometer. Maintenance is suggested once per year. Wrench for opening the lid. The threads can become contaminated from calcium and other minerals in the pool. Replacement lock key. Replacement gasket. The gasket or o-ring should be replaced once per year, or whenever the batteries are charged. Silicone Lubricant. It is recommended you use silicon lubricant on the threads and o-ring to prevent leakage due to expansion, contraction and imperfections in the plastic. Desiccant Packs. The desiccant packs prevent condensation inside the housing.