We do not recommend it, even though it is possible from a technical perspective.
Collet fittings are a costly and proprietary solution from 1 company, which introduce unnecessary costs, delays and complexity as compared with compression fittings.
Epsilon and its partners developed specific fittings based on standard compression techniques, which are manufactured by qualified hardware manufacturers to ensure their reliability. For every HVCRC® project, compression fittings save a lot of time and money to contractors and utilities, without any failure.