Help with durso


New member
I made a standpipe with 1 1/2 pvc reducer to fit in bulk fitting and then a street 90 and a close 90 at the top. drilled two 3/8 holes on the sides of the 90 and a small hole with air line in top. That quieted it down except now I have an air sucking sound almost like a wind blowing sound. Did I do something wrong or is this normal?


New member
I don't think you need the 2 3/8" holes in the sides..
I just kept drilling a little larger in the top of the
endcap until it was silent ..I think I ended up with 1/4 " hole on
1 side and 1/8" on the other.