Delta bathroom and kitchen faucets with two handles are often stem-style faucets that include a neoprene valve seat and spring that fits into the faucet below a cartridge-like insert stem. This is different from a true cartridge-style faucet, which closely resembles a stem faucet but does not have valve seats and springs.
With a stem-style faucet, a neoprene valve seat and spring fit into the water inlet port in the valve body. Over the valve seat and spring, the stem is held into the body with a bonnet nut; the handle then fits onto the top of the stem.
Leaks in this type of faucet can usually be fixed with...
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