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Was considering swapping the vacuum pumps over, but checked their stats. Current one; 16.5 m3/h. Newer one; 8cfm (13.6m3/h, converted).

Worst case I guess I could just silver-solder the adaptor in place and greatly increase the connecting surface area.

I need some sort of pressure limiter and don’t want that hanging off 5mm of brass thread.

Dismantling a refrigeration vac pump manifold however yields a flare to 1/8bsp fitting. But the thread is worryingly short.

I suspect to enforce safe standards of practice in the HVAC industry, 1/4 flare to BSP adaptors are not a thing.