Slimline Drinker. The Riversway Slimline Drinker is designed and distributed solely by Riversway Aviculture Products Ltd, don’t accept anything but the best for your birds! Self clipping to 12.7mm and 16mm punch bar, a superb Drinker that is a 1st to the aviculture world. The drinker channels are offset to the left or right and combined with a revolutionary slimline design that gives the Budgerigar breeder an option to maximize his cage front area, allowing for an improved viewing area of his birds. As with every Riversway product only the highest standard of materials are used. No coatings are used to give the effect of colour tinting, actual coloured materials are used, ensuring a robust and long lasting finish.