The Premium side load transmitter housing sewer bit sub is compatible with 15-in (38.1-cm) and 19-in (48.3-cm) transmitters (all acceptable for wire line). Carries a replaceable rear sub and threaded front for virtually limitless adaptability, including the Armor drilling system and mud motors. Ideal HDD rock tooling for a range of projects, from standard bores to sensitive on- grade sewer work.