A computerized method (400) of producing a customized digital installation guide for a cable, pipe or wire transit is disclosed. A database (50) of transit components (210) and associated (214) installation instruction sections (220) for the respective transit components is provided. A digital order (242) is generated (410) for a customizable transit (1) comprising selected transit components (218). An order identity (244) is assigned (420) to the generated digital order (242). In the database (50) an association (246) is stored (430) between the order identity (244) and the selected transit components (218) of the digital order (242). A machine-readable code (70) representing the order identity (244) is generated (440). A delivery (340) of the selected transit components (218) to an installation site (6) is caused (450) in accordance with the digital order (242). The generated machine-readable code (70) is associated (460) with the delivery (340). A digital installation guide request, comprising the order identity (244) as being derived by a remote computing device (100) reading (465) the machine-readable code (70) associated with the delivery (340), is received (470). The database (50) is searched (480) to determine the transit components (212) associated with the derived order identity (244). Installation instruction sections (222) for the determined transit components (218) associated with the derived order identity (244) are retrieved (490) from the database (50). The retrieved installation instruction sections (222) are compiled (500) into a customized digital installation guide (80) for building a sealed installation of one or more cables, pipes or wires (2) by assembling the delivered transit components (218) to form the transit (1).