We also have the ability to design custom backflow enclosures to fit dual layouts or additional equipment. Our design consultant has 20+ years of experience designing backflow enclosures around equipment in AutoCAD and will be more than happy to help design your backflow enclosure. AquaSHIELD® backflow enclosures are made with marine grade aluminum and ASSE 1060 certified accessories making them the best backflow enclosures for outdoor requirements.