Rubber-Cal"Aluminum Flex 400" Hi-Temp Hose - Ventilation Duct Hose - 12" ID x 5ft Length Hose - - Amazon.com
4 Inch Diameter Clear PVC Schedule 40 Pipe [Pipe ID 4.0 inch, OD 4.5 inch] (Bluish tint), Choose Your Length (5 Inches to 8 feet) (Selected Length: 1 Foot)
9.5mm Internal Diameter, 5/16", PVC TUBE CLEAR PLASTIC HOSE PIPE, IDEAL FOR HOME BREWING SYPHONING BEER & WINE FOOD GRADE, FISH POND CAR AQUARIUM AIR PUMP - BRITISH MADE - FREE UK