Just get a 10mm female to 14mm male joint. Simrell is already a 10mm WPA out of the box. You just need an adapter to fit your water piece.

Highly recommend these, makes for a nice snug fit

https://www.amazon.com/Compact-Female-Essential-Adapter，Glass-Adapter/dp/B08DM3CCBW/ref=mp_s_a_1_17?crid=CMRCTVKGJD0V&keywords=10mm+glass+adapter&qid=1643598612&sprefix=10mm+glass+adapter%2Caps%2C64&sr=8-17

Compact Clear Male 14Mm 10Mm Female Essential Adapter，Glass Tube Adapter https://www.amazon.com/dp/B08DM3CCBW/ref=cm_sw_r_apan_glt_fabc_WM4T5292D67KAC9B3FC6?_encoding=UTF8&psc=1

I use this, is this the one on the right?