Cartridge, Compression, or Ball Faucet? How to Identify Yours Before You DIY
Walk into any hardware store's plumbing aisle and ask for "a faucet washer" and you'll get a blank stare, followed by a dozen questions about what kind of faucet you have. That's because there isn't just one type of faucet mechanism. There are four common ones, and each requires different parts and a different repair process. Guess wrong, and you'll make a second trip to the store or, worse, install the wrong part and create a new leak.
Here's how to figure out which one is sitting under your sink before you buy anything.
Why this matters before you start
Every faucet type controls water flow a different way internally, even though many look similar from the outside. A repair kit for a cartridge faucet won't work on a ball faucet, and vice versa. Knowing your type upfront means you walk into the store once, with the right part in hand (or the old part to match), instead of guessing.
Compression faucets
This is the oldest and simplest design, most common in homes built before the 1980s. You'll recognize it by two separate handles, one for hot and one for cold, that require several turns to shut off completely rather than a quarter-turn. Compression faucets work with a rubber washer that presses down onto a valve seat to stop water flow. Over time that washer wears out and causes the classic slow drip. These are usually the easiest and cheapest faucets to repair.
Cartridge faucets
Cartridge faucets can have one or two handles, and the giveaway is a smooth, easy turn with no real resistance, since the cartridge inside slides or rotates rather than screwing down. Two-handle cartridge faucets are common in bathrooms, while single-handle versions are everywhere in kitchens. When these leak, the whole cartridge typically gets replaced rather than just a washer.
Ball faucets
Ball faucets almost always have a single handle that moves in every direction (up and down for volume, side to side for temperature) and sits on top of a rounded cap with a dome shape underneath. Inside, a slotted metal or plastic ball controls the mix of hot and cold water. These were extremely popular in kitchen faucets through the 1980s and 90s and tend to have more small parts (springs, seats, O-rings) than other types, which makes repair kits a little fiddlier to work with.
Disc faucets
Disc faucets are the modern option, usually identified by a single lever sitting on top of a wide cylindrical body. Inside, two ceramic discs glide against each other to control flow and temperature. These are known for being especially durable and rarely need repair, though when they do fail it's often the whole cartridge assembly that needs replacing rather than an individual part.
A quick way to check if you're unsure
- Turn the faucet off completely and see how many turns it takes. Multiple turns points to compression; a single quarter-turn points to cartridge, ball, or disc.
- Count the handles. Two handles narrows it down to compression or two-handle cartridge.
- If it's a single handle, take the handle off and look underneath. A rounded ball with slots means ball faucet; a straight cartridge sliding into a housing means cartridge; a wide cylindrical body means disc.
- When in doubt, snap a photo of the disassembled internals and bring it with you to the store, or better yet bring the actual worn part.
When identification alone isn't enough
Some faucets, especially older or less common brands, don't fit neatly into these categories, and a few manufacturers use proprietary designs that need brand-specific parts. If you've correctly identified your faucet type but still can't find a matching kit, or you get partway into disassembly and things don't look like what you expected, it's a good moment to stop before you damage something that was otherwise fine.
If you'd rather skip the identification guesswork altogether, ProFlow Plumbing can diagnose the faucet, source the right part, and have the repair done faster than a second trip to the store would take you anyway.