2-in-2-out 12-core fiber optic splicing box (suitable for fiber optic cable diameter 10-20mm), D-type fiber optic splicing box, fiber optic cable connector box, outdoor fiber optic cable splicing kit, fiber optic splicing protection box, communication fiber optic cable waterproof splicing box, engineering fiber optic splicing box, ABS+PC waterproof fiber optic cable connector box, overhead pipeline direct-buried fiber optic cable protection box, black fiber optic splicing box