O-ring is on the black plastic tip. They are Danco, 96750, #36 O-Ring. 5/16"OD x 3/6"ID x 1/16". They were $2.49 for 10 (plus tax of course). http://www.lowes.com/pd_198985-1366-96750___?Ntt=danco+96750&UserSearch=danco+96750&productId=3369374
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