Saturday, December 10, 2022


RV Doctor: Repairing dripping bathroom faucets


Dear Gary:
How do you repair the bathroom faucets? I have a two-handle faucet in the bathroom that looks to be all metal and they constantly drip. How and what do I replace? —Mike R.

Dear Mike:
The most common cause of dripping faucets is debris or mineral deposits becoming stuck in the assembly, so let’s not be too quick to condemn an innocent faucet! All faucets are presumed innocent until proven faulty in a court of law! Or at least until proven faulty.

In some cases, however, older faucets can suffer from worn rubber washers or a fouled cartridge. I’m assuming you’ve already tried to flush any contaminants by fully opening each faucet and letting it run for a few moments. This is best effectuated when connected to a city water source (temporarily remove the pressure regulator if so equipped). If your faucets are indeed metal, chances are they contain seat washers.

If a thorough flushing did not remove the debris and the faucets still drip, it will be necessary to disassemble the faucets and check the seat washers.

First, turn off all water sources and relieve the pressure at the lavatory faucets. Remove the Hot and Cold handles. There is usually a single screw located below each button on top of each handle. Once the handles are off, carefully remove the bonnet lock and washer. Some will just lift off and others may pop off by gently using a flat blade screwdriver. Remove each stem and bonnet assembly using an adjustable wrench or a deep-well socket. I believe you’ll find them to require a 3/4-inch socket. They are removed by turning counter-clockwise.

Now’s the time to carefully inspect each assembly as well as inside the body of the faucet for loose debris and/or mineral buildup. Brush or scrape away any residue you find. Rinse all the parts in clean water. Carefully inspect the bottom seat washer and replace it if it’s dried out, cracked, pinched or distorted in any way. A single screw holds this washer in place. For a quick test (or even a temporary fix), flip that washer over and reassemble the assembly, turn the water back on and check for drips. If the dripping goes away, you’ll know it’s the washer that needs replacing. If the faucet continues to drip periodically, you’ll have to dig further and inspect the seats inside the body of the faucet.

Some faucets have removable seats while others do not. If you see a hexagonal opening in the seats, those can be removed and replaced. Check the top surface of each seat to be sure there are no nicks or cuts. Replace the seats if you feel any sense of scratchiness or roughness. Plastic seats are more prone to damage than brass seats, so check carefully if yours are plastic.

If the faucets, however, contain washerless cartridges, they will also contain an O-ring instead of a flat seat washer. It will also have a filtering device in the body of the shank. Be sure to check the filter screen for debris before reassembling. Faucet seats, washers and O-rings are readily available at any hardware store. Take care whenever threading the seats and the stem/bonnet assemblies into the body of the faucet during reassembly. It’s quite easy to cross-thread them! Instead of a 50-cent repair, you’ll be looking at a complete faucet replacement! After reassembly, turn the water pressure back on and check your work. Faucet repair is not as daunting as some might suspect.

gary-736Read more from Gary Bunzer at the See Gary’s videos about RV repair and maintenance.


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Bob Weinfurt
2 years ago

Before you start dismantling anything, be sure to put something in or over the drain to keep any parts from going down it.

2 years ago

Been a plumber for over 50 years. Good faucets will last a lifetime if they are maintained. Take them apart once a year, replace parts that wear (washers, o-rings, gaskets, etc.). Buy extra set of replacement parts and put them in a baggie. Put a date of replacement on a paper in the bag or write on the bag with a sharpie. Always keep an extra set of parts taped under the sink. This way you have the right parts when you need them.

2 years ago
Reply to  Bill

Take them apart once a year?
You are kidding right?
I have 9 faucets in my home, you are talking about a two day project, IF, no trips for parts are necessary and no doubt a couple of under sink shut of off valve replacements.

Dennis Wenger
2 years ago

Its only ridiculous until you are forced to replace the cabinetry and all of the paper products you stored beneath, due to mold and mildew.