THETFORD Porta Potti Excellence is available in two models, this one being Piston Pump Operated. The Excellence supersedes the popular Porta Potti 465. FeaturesThese feature a gauge that shows how full they are, and includes a Piston Pump to flush with,to ensure effective functionality and optimum performance of the toilet system, Thetford have designed uniquely formulated toilet Additives and rapid dissolving Aqua Soft toilet paper. Thetford toilet Additives prevent unpleasant odours, suppress gas formation and keep the inside of the waste holding tank clean. By promoting the decomposition of solids in the waste holding tank, the Additives also prevent blockages when emptying Specifications Model: T92301 Cequent Dimensions: 448 x 388 x 450 mm (H x W x D) Holding Tank Level Indicator Yes. Waste tank capacity: 21L White in colour. Flushing System - Piston Pump Operated. Toilet Weight 5.5kg Shipping Weight: 6.32 Kgs. Shipping Dimensions: 45 cm x 47 cm x 40 cm.