SPX STONE 4 GAL SQUARE PLASTIC RESERVOIR

Square tanks generally pack into tight spots a lot more efficiently than round ones, and that holds true here. The geometry lets you mount it flush against other components without wasting corner space. Plastic also cuts down on overall weight compared to a steel tank, which matters when you're building or retrofitting a small power unit where every pound adds up. For low-pressure and return-line hydraulic applications, this 4-gallon unit fits that role well.