A feedthrough (800, 900, 1000, 1100), comprising: a first part (802, 902, 1002) comprising: a first body configured to be disposed in a first portion of an opening in a panel, a first lumen disposed within the first body, and a first engagement area comprising a first contact area, the first engagement area comprising a first part inner ridged section; and a second part (804, 904, 1004) comprising: a second body configured to be disposed in a second portion of the opening in the panel, a second lumen disposed within the second body, and a second engagement area configured to engage the first contact area, the second engagement area comprising a second part outer ridged section, wherein the first part inner ridged section is configured to engage the second part outer ridged section such that the first part (802, 902, 1002) is held in place relative to the second part (804, 904, 1004), and wherein engaging the first contact area with the second engagement area causes deformation of the first part (802, 902, 1002), the second part (804, 904, 1004), or both the first part (802, 902, 1002) and the second part (804, 904, 1004) to hold the first part (802, 902, 1002) and the second part (804, 904, 1004) within the opening such that the first lumen and the second lumen are disposed generally concentrically with each other wherein at least a portion of a cross-sectional area of the first engagement area is different from at least a portion of a cross-sectional area of the second engagement area, wherein the second engagement area is configured to engage the first contact area when the first body and second body are rotationally moved into an engagement position. a first part (802, 902, 1002) comprising: a first body configured to be disposed in a first portion of an opening in a panel, a first lumen disposed within the first body, and a first engagement area comprising a first contact area, the first engagement area comprising a first part inner ridged section; and a first body configured to be disposed in a first portion of an opening in a panel, a first lumen disposed within the first body, and a first engagement area comprising a first contact area, the first engagement area comprising a first part inner ridged section; and a second part (804, 904, 1004) comprising: a second body configured to be disposed in a second portion of the opening in the panel, a second lumen disposed within the second body, and a second engagement area configured to engage the first contact area, the second engagement area comprising a second part outer ridged section, wherein the first part inner ridged section is configured to engage the second part outer ridged section such that the first part (802, 902, 1002) is held in place relative to the second part (804, 904, 1004), and wherein engaging the first contact area with the second engagement area causes deformation of the first part (802, 902, 1002), the second part (804, 904, 1004), or both the first part (802, 902, 1002) and the second part (804, 904, 1004) to hold the first part (802, 902, 1002) and the second part (804, 904, 1004) within the opening such that the first lumen and the second lumen are disposed generally concentrically with each other wherein at least a portion of a cross-sectional area of the first engagement area is different from at least a portion of a cross-sectional area of the second engagement area, wherein the second engagement area is configured to engage the first contact area when the first body and second body are rotationally moved into an engagement position. a second body configured to be disposed in a second portion of the opening in the panel, a second lumen disposed within the second body, and a second engagement area configured to engage the first contact area, the second engagement area comprising a second part outer ridged section, wherein the first part inner ridged section is configured to engage the second part outer ridged section such that the first part (802, 902, 1002) is held in place relative to the second part (804, 904, 1004), and wherein engaging the first contact area with the second engagement area causes deformation of the first part (802, 902, 1002), the second part (804, 904, 1004), or both the first part (802, 902, 1002) and the second part (804, 904, 1004) to hold the first part (802, 902, 1002) and the second part (804, 904, 1004) within the opening such that the first lumen and the second lumen are disposed generally concentrically with each other wherein at least a portion of a cross-sectional area of the first engagement area is different from at least a portion of a cross-sectional area of the second engagement area, wherein the second engagement area is configured to engage the first contact area when the first body and second body are rotationally moved into an engagement position.