Dometic Replacement Spring Cartridge is offered in 2 different versions. If your pedal is no longer returning “up” after flushing and the 1/2 ball will not close, it may be time to replace your spring cartridge. The White (amber-colored) cartridge is for bases with a metal lever. The Black Spring cartridge is for all plastic pedals. Please select carefully. Many of Dometic’s, pedals have a plastic cover over a metal rod.