I'm sure a few of you read my braided hose upgrade thread for my quick mill Anita. I discovered the elbows I'm going to be using are a BSP tapered thread. Will I be able to use these elbows with the parallel female threads on the pump and into the tee on the boiler fill solenoid?

From my experience with threads and sealing them correctly, you absolutely want the same type of thread on both sides to match up as perfectly as possible without relying on teflon tape or sealant to fix the seal for you.

Generally tapered threads will seal easier, but if the pump has straight threads, you're better off to get a fitting that converts them even if mechanically they seem to join together. Most likely without a ton of sealant, tapered to straight just won't work, and even then I wouldn't be sure of the longevity of the connection personally.

Yeah so sounds like I'm going to have to find some parallel threaded elbows