The FC/APC to FC/APC Simplex Singlemode Small D Metal Fiber Optic Adapter Without Flange is a precision coupler designed for stable, low-loss, and high-reliability connections between two FC/APC connectors in singlemode fiber optic systems. Featuring an Angled Physical Contact (APC) interface, it effectively minimizes back reflection and ensures excellent optical performance in demanding environments such as telecommunications, CATV systems, and optical measurement setups.