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You wan't proper van port fittings.Speak to www.grippatank.co.ukIn 2 years i have yet to have a drip from any of the fittings they have supplied (1 year on van, and i have 2 year old fittings in general before Mr Troll comes out)https://www.grippatank.co.uk/wfp-purification-systems/reels-hoses-connectors/hose-connectors-fittings/qr-metal-couplings