First of all, I assume you are talking about the PGP heads, last time I checked Hunter doesn't make a head that is on crack (PCP)...:p - The warranty for the PGP heads is 2 years. Hunter stamps the date of manufacture on the top of the head, in a small circle where the top cap threads on. If it was manufactured in 2005, it will say 05 on the top of the head.
Tony Posey
Ridge Run Landscapes
