sera 45065 Hose Connection Inner Dimensions 12 to 16 mm Aquariums, Hose Connector 12/16 to 16/22, Reducer 16/22 to 12/16, Hose Reducer External Filter, Reducer for Aquarium, 32141 : Amazon.co.uk: Pet Supplies
JBL Air Hose2.5 m length, 12/16 mm diameter, Grey , Aqua Hose, 6108800 : Amazon.co.uk: Pet Supplies
ARKA Aquatics - PVC hose 12/16 mm (100m (roll), Blue) : Amazon.co.uk: Garden
LMA336 - 12" x 5/16" ID PETROL HOSE + CAPS + CLIPS from Rally Design
Hose Diameter 12/16 Mm 10 Metre for sale online | eBay
JBL Tube 2.5 m in length, 12/16 mm diameter, green , Water hose for aquariums : Amazon.co.uk: Pet Supplies