Precision Marine R36 Refugium.Fabricated entirely of Made in U.S.A. cast acrylic, check out the appointments of the Precision Marine refuge tanks. Our plastic fabricators give attention to every detail. Better yet, check the price. It’s all about performance, value and service at PM. R36 Specifications: - Overall dimensions: 36" x 14" x 16" - Interior Refugium Dimensions: 13.5" x 18 3/4" - Protein Skimmer Chamber: 13.5” x 11.5” - Pump Chamber Dimensions: 13.5” x 9” - Drain Size: Dual 1” Bulkheads