The Perforated Spacer Tube is installed at the end of a tubing string to provide an alternate flow path when wireline measuring devices are used. It is manufactured from low-grade material and consists of a perforated nipple with standard tubing threads, a crossover coupling on the up hole end, and a crossover sub on the downhole end.

Perforated Spacer Tubes can also be supplied with special box threads up and pin threads down upon request.