12mm (ID) or 13mm (ID). Both free of charge for the UK. Same day dispatch most days. We will happily answer any questions you may have and assure you of our best customer service at all times.
The item "CLEAR PVC Tubing Hose Pipe Pond Aquarium Fish Tank Air Pump FDA Marine Tub" is in sale since Wednesday, February 21, 2018. This item is in the category "Business, Office & Industrial\Hydraulics, Pneumatics, Pumps & Plumbing\Pumps & Pump Accessories\Pump Parts & Accessories\Other Pump Parts & Accessories". The seller is "innofinity-worldwide" and is located in London. This item can be shipped worldwide.