All our Tanks' Coils have 3/4" NPT Male Thread while our Brass Solar Pipe Fittings have BSP Thread. Connecting or Forcing a BSP thread to an NPT thread can damage the tightness of the threaded connection and cause leaks. This is simply a NPT to BSP adapter:
This Kit Includes the followings:
TK1 & TK2: FEMALE NPT TO MALE BSP CONNECTOR WITH BRASS NUT, HT WASHER,SS CIR-CLIP (QTY=2).