Sloan ETF510A 8” Trim and Cover Plate Chrome For Optima And Optima Plus Models. For use with EAF-200/250/275, EBF-187 and ERF-885, EBF-85, ELF-10, ESF-20, ETF-80, ETF-880 Trim and cover plates cover the faucet holes and the hardware that mounts the faucet to a surface. They keep water from getting under the sink and help prevent hardware from rusting. Also called deck plates, they're often used when changing from a multi-hole faucet to a single-hole faucet.