Sealing BSP parallel threads

9 Mar 2008
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United Kingdom
What is the best way to seal 3/4" BSP parallel to parallel threads.
The shower valve I have states use parallel fittings only.

I need to seal the incoming water fittings (15mm to 3/4" BSP parallel) and a blanking plug at the bottom.

I can only assume that the female threads in the valve are parallel as the blanking plug screws in right up to the boss.

Hope someone can help.
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Parallel threads are usually designed with the idea that a soft washer or 'O' ring will be used, the thread itself does not usually form part of the seal.

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