Abstract: An industrial piece-part washer includes a plurality of risers depending from overhead liquid supply headers. Each riser is formed as a continuous length of pipe, along which nozzles are positioned to direct wash liquid to contact the articles to be washed. Each riser is bent, along its length, to angle said nozzles into a selected spray pattern, and each is attached at its upper end to a supply header, and at its lower end to an end cap having a weep hole formed therein. Said riser connections are formed as slipfittings so that no threads are required on the risers, and no threads are directly exposed to the liquid during washing operations.