Pilot/ Sonde Housing (2 3/8"~6 5/8" FH) Connection: Direct connection with drill pipe, Octagonal connection, Side-opening Octagonal connection back-load transmitter housing Standard connection side -load transmitter housing Choose the suitable drill bit based on different soil condition to improve construction efficiency. Good wearing, connviences to demount and maintain. Available for all makes (XCMG, Ditch Witch, Vermeer, Astec, others) and bolt hole patterns. 3.5", 4", 4.5" and 5" cut. Sonde Housings with a variety of thread configurations. Our Side-Load Housings are manufactured from American-Made 4140 Alloy. Our Heat Treatment Process and optional Hard Facing give you the wearability you can count on. They are offered for Duck Bill or Carbide Bits. All of our sonde housings are machined from heat treated 4140 Alloy for superior strength and durability.Side load feature provides for quick installation and removal of transmitter sonde and batteries.Hex-style connection on the 2-3/4" and 3" models provides for quick disconnect from the drillstem.