A frame assembly for a frame pool, comprising a horizontal support having a first end and a second end opposite the first end; a vertical support having an upper end and a lower end opposite the upper end; a T-joint connecting one of the ends of the horizontal support to the upper end of the vertical support; and a coupling assembly (200, 300, 400, 500) releasably connecting a corresponding one of the horizontal support or the vertical support to the T-joint including: a collar (210, 310, 410, 510) having a tubular body configured to be disposed around the T-joint and one of the ends of the corresponding one of the horizontal support or the vertical support; a guide (211, 311, 411, 511) extending outwardly from the tubular body; and a limiting member (212, 312, 412, 512) movable through the guide (211, 311, 411, 511) between an unlocked position and a locked position to selectively retain the corresponding one of the horizontal support or the vertical support to the T-joint; wherein the guide (211, 311, 411, 511) comprises a tube extending in a first direction perpendicular to a length of the tubular body of the collar (210, 310, 410, 510), and a slot in the tube extending in the first direction; and the limiting member (212, 312, 412, 512) comprises a lug extending perpendicularly to the slot and moveable within the slot between the unlocked position and the locked position. a horizontal support having a first end and a second end opposite the first end; a vertical support having an upper end and a lower end opposite the upper end; a T-joint connecting one of the ends of the horizontal support to the upper end of the vertical support; and a coupling assembly (200, 300, 400, 500) releasably connecting a corresponding one of the horizontal support or the vertical support to the T-joint including: a collar (210, 310, 410, 510) having a tubular body configured to be disposed around the T-joint and one of the ends of the corresponding one of the horizontal support or the vertical support; a guide (211, 311, 411, 511) extending outwardly from the tubular body; and a limiting member (212, 312, 412, 512) movable through the guide (211, 311, 411, 511) between an unlocked position and a locked position to selectively retain the corresponding one of the horizontal support or the vertical support to the T-joint; wherein the guide (211, 311, 411, 511) comprises a tube extending in a first direction perpendicular to a length of the tubular body of the collar (210, 310, 410, 510), and a slot in the tube extending in the first direction; and the limiting member (212, 312, 412, 512) comprises a lug extending perpendicularly to the slot and moveable within the slot between the unlocked position and the locked position. a collar (210, 310, 410, 510) having a tubular body configured to be disposed around the T-joint and one of the ends of the corresponding one of the horizontal support or the vertical support; a guide (211, 311, 411, 511) extending outwardly from the tubular body; and a limiting member (212, 312, 412, 512) movable through the guide (211, 311, 411, 511) between an unlocked position and a locked position to selectively retain the corresponding one of the horizontal support or the vertical support to the T-joint; wherein the guide (211, 311, 411, 511) comprises a tube extending in a first direction perpendicular to a length of the tubular body of the collar (210, 310, 410, 510), and a slot in the tube extending in the first direction; and the limiting member (212, 312, 412, 512) comprises a lug extending perpendicularly to the slot and moveable within the slot between the unlocked position and the locked position.