Used 4 Sq Ft Oberlin Model OPF04 Pressure Filter Coolant System. Surface Area: 4 square foot / .371 square meter. Filter pressure: 45 psi. Stainless steel. Clean Tank Supply, Dirty Tank Return, Pressure Filter with Filter Paper Disposable Media. Clean Tank Pump Motor: 460 Volt, 3/60, with Panel and Type 12 enclosure. Approximate dimensions: 134" x 76" x 78".