Crosswater valve conundrum.

[Annker]

I have been driven up the wall trying to figure out how to connect pipework to a Crosswater Fusion concealed shower valve.

To my mind the installation instructions contradict themselves and I'd appreciate to hear a more qualified interpretation than my own (I'm a Carpenter not a Engineer of any description)

 

The valve has:

• G 3/4" (BSPP) female shower head port. There is no seat for a rubber seal to sit in this port (and none show on the diagram)
• G 3/4" (BSPP) male H&C inlet ports. Rubber edged gauze washer/filter are required to be installed on the ports 

 

The instruction specifically state:

• Make all pipe connections using a proprietary thread sealer
• Do not use tapered threaded adaptors

 

My understanding is that a female port (where a rubber seal and seat for that seal is absent) requires the mating male to be tapered thread (BSPT) and wrapped with thread sealer to make the joint; and where the male ports have a rubber edge filter provides the seal then using thread sealer (Locktight 55 cord for example) may hinder making the joint.

If that understanding is correct then the instruction are surely contradictory?