The Fluval Transformer for 8.5 (32 L), 16 (60 L) & 23 US Gal. (87 L) Bentglass Aquariums. It is recommended for the Fluval Vistas 8.5 US Gal. (15242, 15245, 15248), the Fluval Vues 23 US Gal. (87 L) (15249, 15279) and the Marina Curve 8.5 US Gal. (32 L), 16 US Gal. (60 L), 23 US Gal. (87 L).