Kailua-Kona, Hawaii ? Larry Parker’s race number said it all 343.

The New York firefighter wore it to remember the 343 firefighters who died in the Sept. 11, 2001, terrorist attacks on the World Trade Center.

Parker, of Ladder 129 in Queens, also wore a T-shirt with the names of all 343 printed on the back for the bicycle ride and run of the Ironman Triathlon World Championship.

“There were some rough spots, and they carried me,” said the 39-year-old Parker, from Amityville, N.Y., after he finished the 2.4-mile ocean swim, 112-mile bicycle ride and 26.2-mile marathon in 10 hours and 17 minutes.

His time was 8 minutes faster than his finish in the 2000 race.