The Separett Privy Kits convert your existing outhouse or latrine to a urine diverting system. The 501 is a snazzy version which includes a folding toilet seat! The reduction of urine from solids greatly reduces the odor and decomposition periods. The units installs on the latrine platform and the attached urine hose diverts fluids from the current holding location. Warranty period is two years.The shipping box includes a template for the seat cut out. If you are considering mounting directly over a bucket -it requires a 14 inch diameter top. The folding seat of the 501 allows for airflow through the seat into the latrine compartment. It is best used with a fan vented latrine.