1588908-3 is a sealed singlemode ferrule kit designed for Pro Beam Jr. fiber optic connector applications. This ferrule sub-assembly features a PC (Physical Contact) polish type and incorporates a stainless steel and zirconia (ZrO2) ferrule construction with a fiber hole diameter of 125.5µm. The kit includes a vinyl protective cap, nitrile O-ring for sealing, and a stainless steel spring. With overall dimensions of 18.15mm length and 4.67mm width, and a minimum diameter of Ø1.53mm, this ferrule kit provides reliable fiber alignment and protection in singlemode optical connections.