Drill the holes straight through the cross-tube, through top and bottom and side to side. Use tubing and hole sizes that don’t compromise the strength of the tubing and a total number of holes so their area is greater than the combined area of the bowl vents. If you have an air cleaner stud, use tubing big enough that a hole to pass the stud through the tube will not weaken it and pass the stud through the tube. 3/8” tubing with a ¼” stud and 7/16” tubing with a 5/16” stud. The hardware store has thin wall brass tubing that is excellent for this purpose.
They are used in Tractor/Trailer air brake systems. All the newer stuff is now push lock for the air brake systems except the brake chambers of which are JIC 37 degree or just NPT due to vibration. They come in brass/stainless and plastic. The plastic ones are the ones most prone to fail which i replace the most with stainless or brass due to heat and vibration, ice and snow. Many manufacturers. Example>>http://www.parker.com/portal/site/PARKER/menuitem.7100150cebe5bbc2d6806710237ad1ca/?vgnextoid=f5c9b5bbec622110VgnVCM10000032a71dacRCRD&vgnextfmt=default&vgnextdiv=&vgnextcatid=196153&vgnextcat=PTC&Wtky=FITTINGS
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