The vessel sink faucet I bought on e-bay has a larger water line connection than the 3/8" on my shut off valve. Anyone know what size it is? And do they make an adapter to fit the 3/8" valve?
Thanks to anyone who can help. Already made a trip to Ace hardware and they were no help...

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Your angle stop is probably 1/2" IP ( or Comp ). Buy conversion ring or replace angle stop.