Tubelite 400IG Series (Inside Glazed) Curtainwall framing for low- and mid-rise applications has been redesigned for installation labor savings and design flexibility. Offset glass pockets and removable glass stops allow glazing or re-glazing from both the exterior and interior of the building. Broken lites can be replaced without removing the vertical pressure plates or snap covers. The new roll-over horizontal member permits erection of all the verticals first to reduce installation time and cost. Open back head and jamb members provide economical alternatives to the previous hollow tube perimeters.