Here's how i did the venturi, the parts used are
1/2" barb to slip joint fitting(gray fitting)
tip from a silicone tube (screw on type)
1/4" 90 deg (from garden section home depot)
section o 1/2" pvc
Here is the parts cut and readdy to go into the pvc. They are justpush fit as i wanted to be able to take all this apart if it didn't work. The barb fitting is 1 3/8" long, silicone tube end 2 /34" long and the pvc is 3 1/4" long
Here is the 1/4" 90deg i used, you have to take the barb down on one side to fit it in the hole you drill.
Drill a 5/32" hole 3/16" up from the barb fitting end of the pvc, once everything is pushed together firmly.
And here it is all put together, the end that goes over the pump input had to be heated slitly to fit. Just heat it with a lighter ect just till it softens and push it on so it's a snug fit.
Clinton