Abstract: A pipe laser device is attached to plumbing that will be added to or extended to show the angle and direction of where the existing plumbing is pointing so the installer knows precisely where to drill to accommodate the new plumbing. The pipe laser has an adaptor/connector that can fit inside an existing plumbing pipe to attach the pipe laser device to the existing pipe. The device has an emitter (laser diode) within the device that delivers the beam (laser beam) from the opposite end of the device. The laser diode is centered on connector that sits within the existing pipe, and so allows the laser beam delivered from the other end to also be centered relative to the existing pipe. Thus, the beam from the opposite end can precisely indicate where on an opposing wall the opening should be created for the existing plumbing to continue through that wall.