MPO keystone coupler is engineered for high-performance single mode OS2 fiber optic connections, supporting 8, 12, and 24-core MPO cables in a Key Up/Key Up orientation. The grey housing denotes APC polish, ensuring ultra-low back reflection and optimal signal integrity for long-distance links exceeding 10 km. Precision zirconia ceramic alignment sleeves maintain accurate core positioning for minimal insertion loss, even under repeated mating cycles. Its keystone form factor allows seamless installation into patch panels, wall plates, or enclosures, making it ideal for structured cabling systems in telecom, data center, and enterprise backbone networks where maximum stability and low loss are critical.