Founded in 1923, Sellstrom Manufacturing Co. Replacement Manifold Assembly, Fits 16 Gallon Portable Gravity Feed The Sellstrom replacement manifold assembly fits the 16 gallon self-contained gravity-flow portable eyewash station (Model S90320). From safety goggles to face shields and more, our long history in pioneering industry-leading personal protective products means our equipment is designed with your safety and productivity in mind..