Does Plumbing Vent Go Before or After the Trap?

If you’ve ever wondered, “Does plumbing vent go before or after trap?”, you’re not alone. Many homeowners and even DIY enthusiasts get confused about vent placement in their drain-waste-vent (DWV) system. Getting this wrong can lead to slow drains, gurgling sounds, or worse—sewer gases leaking into your home. Let’s clear up the confusion with a…