• Couplings are widely used to connect compressed air and low-pressure fluid lines
• Compact and economical design uses a ball locking mechanism consisting of captive steel balls that engage the locking groove on the mating nipple
• Sliding spring-loaded sleeve on the coupler must be manually retracted in order to connect or disconnect the nipple
• Easy to do, but two hands are normally required
• Steel valve, NBR seat, and stainless-steel springs