A variety of applications. Use it to convert your Kral nipple on the gun to connect dirrectly to yout female quick coupler on your pump, compressor or fillstation without using the supplied Kral Coupler
1/8” M(BST) x 1/8” M(BSP) adaptor used in joining filling hoses to the BST-1 micro coupler as well as the BST-1M nipple. Use this if you own more than one PCP and you want to quickly change filling nipples between different brands. The optional requirement for all American brands of air rifles/pistols.