Scuba charging set Fits k-valves Hose ends with 1/8 female BSPP No extra adapters needed if you use this for the following guns: Air Arms, Evanix, Sumatra, BAM & Sam Yang Big Bore 909 (the adapter included with these guns attaches to this set) Also fits these guns, but you'll need to get the adapters indicated:• Marauder, Discovery & Challenger rifles: you'll need Quickadap1EM1B (female quick-disconnect adapter)• Dragon Slayer, Fire 202 & 707 Ultra rifles (which come with 7/16 probes): you'll need PYadapterEJ