Delta/Peerless are both made the same, both made by the Masco Corporation. Internal parts are compatible to each other with Peerless being the lesser of both brands.

Are Delta and Peerless cartridges the same?

Delta and Peerless are interchangeable for what it is worth. Backed by Delta Faucet Company, the largest U.S. manufacturer of residential and commercial faucets, all Peerless faucets come with a limited lifetime faucet and finish warranty. ... In most cases both delta and peerless faucet repair parts are interchangeable.

Is Peerless faucets owned by Delta?

Peerless is Delta Faucet's line of "value-priced" faucets. ... Despite its lowly status, however, Peerless faucets are well-made and still carry the same lifetime warranty as high-end Brizo and mid-range Delta faucets.