A device (200, 300) for connection to a medical connector, the device comprising: an outer cap (202, 302) comprising an integral body (204, 304), a closed end (206, 306), an outer cap annular wall (208, 308) having a length L O3 extending from the closed end to an open end (210, 310) and defining a chamber (212, 312) containing an absorbent material (214, 314) and disinfectant or antimicrobial agent, the open end defining an end face: (216, 316); a peelable seal (250, 350) on the end face to prevent the disinfectant or the antimicrobial agent from exiting the chamber; the outer cap annular wall having an outer cap exterior wall surface (218, 318) and an outer cap interior wall surface (220, 320), the outer cap interior wall surface having one or more grooves (224, 324) and one or more threads (222, 322) adapted to engage with a female luer connector, wherein at least a portion of said one or more threads on the outer cap interior wall surface comprise one or more gaps; an inner cap (232, 332) slidably engaged with the outer cap comprising an integral body (234, 334) having an annular wall (236, 336) having an exterior wall surface (238, 338) and an interior wall surface (240, 340) with a first end (242, 342) of the inner cap facing the closed end (206, 306) of the outer cap, a second end (244, 344) of the inner cap facing the open end (210, 310) of the outer cap, characterized in that the exterior wall surface (238, 338) of the first end of the inner cap (232, 332) includes two shaft-like wings (247, 347) to fit into the one or more grooves (224, 324) of the outer cap interior wall surface (220, 320) and facilitate a slide motion without allowing significant relative rotation between the inner cap with respect to the outer cap, the exterior wall surface (238, 338) of the second end of the inner cap (232, 332) having one or more thread-tabs (248, 348) adapted to engage a male luer connector, wherein the inner cap is in a slidable arrangement with the outer cap. an outer cap (202, 302) comprising an integral body (204, 304), a closed end (206, 306), an outer cap annular wall (208, 308) having a length L O3 extending from the closed end to an open end (210, 310) and defining a chamber (212, 312) containing an absorbent material (214, 314) and disinfectant or antimicrobial agent, the open end defining an end face: (216, 316); a peelable seal (250, 350) on the end face to prevent the disinfectant or the antimicrobial agent from exiting the chamber; the outer cap annular wall having an outer cap exterior wall surface (218, 318) and an outer cap interior wall surface (220, 320), the outer cap interior wall surface having one or more grooves (224, 324) and one or more threads (222, 322) adapted to engage with a female luer connector, wherein at least a portion of said one or more threads on the outer cap interior wall surface comprise one or more gaps; an inner cap (232, 332) slidably engaged with the outer cap comprising an integral body (234, 334) having an annular wall (236, 336) having an exterior wall surface (238, 338) and an interior wall surface (240, 340) with a first end (242, 342) of the inner cap facing the closed end (206, 306) of the outer cap, a second end (244, 344) of the inner cap facing the open end (210, 310) of the outer cap, characterized in that the exterior wall surface (238, 338) of the first end of the inner cap (232, 332) includes two shaft-like wings (247, 347) to fit into the one or more grooves (224, 324) of the outer cap interior wall surface (220, 320) and facilitate a slide motion without allowing significant relative rotation between the inner cap with respect to the outer cap, the exterior wall surface (238, 338) of the second end of the inner cap (232, 332) having one or more thread-tabs (248, 348) adapted to engage a male luer connector, wherein the inner cap is in a slidable arrangement with the outer cap.