Abstract: A fluid-handling component comprises a support element having a surface and an aperture extending through at least a portion of the support element and opening to the surface. The fluid-handling component further comprises a liner disposed on the surface of the support element and having a first liner surface facing away from the surface of the support element. The liner covers the aperture and has a back liner surface facing in a direction away from the first liner surface. A cover member is also secured to the support element and configured to cover the aperture, where the cover member has an inner surface that faces the back liner surface.