A refillable dispensing system comprising: a filling station including a docking connector, the filling station configured to dispense a chemical product solution from a chemical product concentrate; a product package comprising a neck and configured to receive a quantity of the chemical product solution dispensed from the filling station; and a fitment insert fitted within a neck of the product package, the fitment insert configured to mate with the docking connector and form a sealed connection therewith, the fitment insert further comprising: a fitment insert body including a first bore defining a fluid passage from a first side of the fitment insert body to a second side of the fitment insert body, the fitment insert body further including an interior wall forming a circumferential ridge around an interior of the fluid passage; a tubular barbed member having a first end and a second end and configured to fit within the fluid passage of the fitment insert body with the first end disposed toward the first side of the fluid passage, the tubular barbed member having a second bore extending from the first end to the second end; a check ball seal disposed between the first end of the tubular barb member and the circumferential ridge; and a check ball that is biased to a closed position with respect to the check ball seal within the fluid passage, the check ball further disposed to slide within the second bore between the closed position and an open position; the docking connector further comprising: a docking connector body; and a fill probe configured to depress the check ball from the first side of the fitment insert body and move the check ball from the closed position to the open position when the fitment insert is mated with the docking connector, such that the quantity of chemical product solution is dispensed from the filling station into the product package. a filling station including a docking connector, the filling station configured to dispense a chemical product solution from a chemical product concentrate; a product package comprising a neck and configured to receive a quantity of the chemical product solution dispensed from the filling station; and a fitment insert fitted within a neck of the product package, the fitment insert configured to mate with the docking connector and form a sealed connection therewith, the fitment insert further comprising: a fitment insert body including a first bore defining a fluid passage from a first side of the fitment insert body to a second side of the fitment insert body, the fitment insert body further including an interior wall forming a circumferential ridge around an interior of the fluid passage; a tubular barbed member having a first end and a second end and configured to fit within the fluid passage of the fitment insert body with the first end disposed toward the first side of the fluid passage, the tubular barbed member having a second bore extending from the first end to the second end; a check ball seal disposed between the first end of the tubular barb member and the circumferential ridge; and a check ball that is biased to a closed position with respect to the check ball seal within the fluid passage, the check ball further disposed to slide within the second bore between the closed position and an open position; the docking connector further comprising: a docking connector body; and a fitment insert body including a first bore defining a fluid passage from a first side of the fitment insert body to a second side of the fitment insert body, the fitment insert body further including an interior wall forming a circumferential ridge around an interior of the fluid passage; a tubular barbed member having a first end and a second end and configured to fit within the fluid passage of the fitment insert body with the first end disposed toward the first side of the fluid passage, the tubular barbed member having a second bore extending from the first end to the second end; a check ball seal disposed between the first end of the tubular barb member and the circumferential ridge; and a check ball that is biased to a closed position with respect to the check ball seal within the fluid passage, the check ball further disposed to slide within the second bore between the closed position and an open position; the docking connector further comprising: a docking connector body; and a fill probe configured to depress the check ball from the first side of the fitment insert body and move the check ball from the closed position to the open position when the fitment insert is mated with the docking connector, such that the quantity of chemical product solution is dispensed from the filling station into the product package.