6.9 dry sump oil hoses. - The fittings are simply screwed in, initially into the collar and then into the hose itself. the fitting is tapered, starts off narrow and expands towards the end, dead simple. Disasembled all 6 fittings on mine, cleaned them out and resealed them with high temperature oil gasket maker, these hose fittings will never leak again. The hose rubber itself is in excellent condition for its age. I certainly cant imagine getting the hose itself would be that hard in this mining rich state.