Plumbing roof vents, modern vs. old style

[Tribetime]

1. You can try to put an inline vent under the bathroom sink

Or it's called an air admittance valve and they should sell them at the hardware Home Depot or Lowe's you may be able to do with yourself if you're a little bit handy..... is there a bathroom above that you flush the toilet and then you hear gurgling in the downstairs toilet or sink... if that's the case yeah they didn't invent it correctly they can't tie the lower bathroom toilet directly on the line they have to go up to a side Vince and then over to this stack pipe.. if it's always done it since you moved in it's a vent problem if it's just something that's happened recently then it's a drain problem I've been doing Service Plumbing for 30 some years