Hissy Fits

Our metal-valved tubes are fitted with double locking nuts to ensure a positive seating and prevent chafing around the union between the valve and the tube itself. The diagram below shows how they should be fitted. Note the small gap below the inner locking ring and tube. You should wind the inner ring away from the valve base by 1-2mm, then tighten the outer hexagon nut to clamp the rim.