I have the same Problem at the same install Method I found that the S.STEEL Clamp tends to Rotate as You Tighten it,You need to CAREFULLY since the little washer (White) Seal is FRADGILE,Losen the clamp and Keep the Probe ahead of the Tightening rotation so that when tight It is squere to the pipe or it will not seal
Hope this Helps
Shawn_O
Hope this Helps
Shawn_O