The Pool Guy - S7-E8
Trivia: When Jerry, Elaine, and Susan are at The Movie "Chunnel", Susan is annoyed while Jerry and Elaine are talking during The Movie. Listen to The Movie dialogue in the background of the scene. The Voice which yells "Everyone out of the chunnel!" is that of co-creator Larry David.
Trivia: The man who returns George's $20 bill and says "Sorry, your highness, but we don't accept bills with lipstick on the president", is the show's co-creator Larry David.
Answer: The name is Delores. He shouts that name at the end of the episode. Then in a later episode, "The Foundation", he runs into her. And he repeatedly calls her Delores.