SELECT MAX("Production Code") FROM table_516 WHERE "Title" = 'But There''s Clay'
What is the production code of the episode titled, 'But there's Clay'?
CREATE TABLE table_516 (
    "Series Ep #" real,
    "Season 2 Ep #" real,
    "Title" text,
    "Director" text,
    "Writer(s)" text,
    "Original Airdate" text,
    "Production Code" real
)