Precision Marine R36+ PLUS 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 16" x 16" - Protein Skimmer Chamber: 15.5”x 15.5” - Interior Refugium Dimensions: 10.5”x 15.5” - Pump Chamber Dimensions: 6.75” 15.5” - Drain Size: Dual 1” Bulkheads