You left off the delayed H at the end, it's OFFC'H. Pronounced "offk-AH." The glottal stop is very important, as there is a similar brand without it. Mispronounce it at the supply house and you go home with the wrong parts. How embarrassing.Don’t listen to these guys, it’s an “OFFC”
The worst part will be your spouse telling you that you should have called a plumber in the first place.