If you have a thin drill bit handy to use for part 4 , plus short plastic threaded nut & bolt .
1 drill hole in cap, 2 place bolt through cap threaded part uppermost (which you will use to attach tubing) 3 attach plastic nut, 4 drill down through centre of plastic thread , you can drill through the thread first if you wish .
1 drill hole in cap, 2 place bolt through cap threaded part uppermost (which you will use to attach tubing) 3 attach plastic nut, 4 drill down through centre of plastic thread , you can drill through the thread first if you wish .