oil tank union nut -oil seal to oil out hose

[hoogerbooger]

just about to put oil tank /pipes back on.

I have a union nut that screws onto the bottom of the filter & a connecting metal oil pipe that goes through and pushes into the oil hose. Looking at the parts diagram (parts 13 & 14) below it seems it's not intended to any form of extra sealing:

https://www.draganfly.co.uk/index.php/bsa/bsa/b40/category/1191-oil-tank-air-filter-toolbox

Just wondering is this design is reliable or leaky ? and if leaky any tips on sealing

I've just removed the paint and muck I had on them and the pipe seems to seat ok in the nut

[AWJDThumper]

It relies on the taper on the metal pipe mating with the opposite taper on the filter housing. As long as the tapers aren't damaged, it should seal ok.