Abstract: Described is a device for protecting a pipe, tube or conduit end that is left open or exposed without a fixture or terminating end. Instead of tape placed over an open pipe end, a specially shaped and marked protective cap provides a seal and a unique marker for each pipe end. The marker may be color coded, bar coded or numbered. Such protective cap seals pipe ends against moisture, dirt and other debris thereby reducing or eliminating corrosion. Such protective cap reduces installation time as compared to removing tape and tape residue from each pipe end. The unique marker can indicate the purpose and identity of each underlying pipe or tube. Such protective cap also improves the visibility of the pipe ends during construction thereby increasing the safety of a job or construction site.