Accessories for snorkeling
ABC equipment is the term for the most basic equipment for snorkeling - mask, snorkel and fins. There're found a lot of small parts which are necessary for using the equipment. It's also nice to have extra if something breaks so you don't have to cancel the snorkeling trip.
ABC equipment refers to the basic snorkeling gear: a mask (or goggles), snorkel, and fins. In addition, there are many small parts that are either essential for using the gear or simply nice to have extras of in case something breaks—so you can avoid having to cancel your trip to the water.