Pride Plumbing came out and repiped and replaced the drain lines under the house in the crawlspace, going to a) the fixtures in the kitchen (sink and dishwasher), a utility sink, and one bathroom (sink, toilet, and bathtub/shower - replacing the toilet bowl's flange and wax seal gasket and the P-traps underneath all the sinks); and b) the washing machine - installing new PVC piping, fittings and supports under the house for each fixture. We also added air admittance valves to the drain lines for the kitchen and utility sinks.