A method of using a coolant tube in a liquid cooled plasma arc torch, the coolant tube comprising a substantially hollow, elongated coolant tube body including a proximal end, a distal end, and a longitudinal axis extending therethrough, the method comprising: installing the coolant tube in the plasma arc torch, the coolant tube includes an O-ring at the proximal end; installing a first electrode in the plasma arc torch such that the distal end of the coolant tube is located within an interior cavity of the first electrode; providing a first coolant flow to the plasma arc torch through the hollow coolant tube body; biasing, by the first coolant flow, the coolant tube against the first electrode, such that the coolant tube translates along the longitudinal axis to contact the first electrode, the biasing by the first coolant flow defining a first distance in the longitudinal direction between the O-ring of the coolant tube and a proximal end of the first electrode; removing the first electrode from the plasma arc torch; installing a second electrode in the plasma arc torch such that the distal end of the coolant tube is located within an interior cavity of the second electrode; providing a second coolant flow to the plasma arc torch through the hollow coolant tube body; and biasing, by the second coolant flow, the coolant tube against the second electrode, such that the coolant tube translates along the longitudinal axis to contact the second electrode, the biasing by the second coolant flow defining a second distance in the longitudinal direction between the O-ring of the coolant tube and a proximal end of the second electrode; wherein the first electrode has a first length along the longitudinal axis and the second electrode has a second length along the longitudinal axis, the first length being different from the second length, and wherein a difference between the first distance and the second distance is at least about 6.35 mm (0.25 inches). installing the coolant tube in the plasma arc torch, the coolant tube includes an O-ring at the proximal end; installing a first electrode in the plasma arc torch such that the distal end of the coolant tube is located within an interior cavity of the first electrode; providing a first coolant flow to the plasma arc torch through the hollow coolant tube body; biasing, by the first coolant flow, the coolant tube against the first electrode, such that the coolant tube translates along the longitudinal axis to contact the first electrode, the biasing by the first coolant flow defining a first distance in the longitudinal direction between the O-ring of the coolant tube and a proximal end of the first electrode; removing the first electrode from the plasma arc torch; installing a second electrode in the plasma arc torch such that the distal end of the coolant tube is located within an interior cavity of the second electrode; providing a second coolant flow to the plasma arc torch through the hollow coolant tube body; and biasing, by the second coolant flow, the coolant tube against the second electrode, such that the coolant tube translates along the longitudinal axis to contact the second electrode, the biasing by the second coolant flow defining a second distance in the longitudinal direction between the O-ring of the coolant tube and a proximal end of the second electrode; wherein the first electrode has a first length along the longitudinal axis and the second electrode has a second length along the longitudinal axis, the first length being different from the second length, and wherein a difference between the first distance and the second distance is at least about 6.35 mm (0.25 inches).