The SKS Non-Return Valve (Brass 3/8in Air Line) is a high-quality, durable fitting designed to prevent water from backflowing into air pumps and other equipment in aquarium and pond setups. Constructed from brass for long-lasting use, this valve is compatible with 3/8-inch air lines, offering a secure and reliable connection to protect your aquatic system's components. Its precision engineering ensures efficient operation, providing peace of mind to hobbyists and professionals by safeguarding their investments in air circulation and filtration systems.