https://www.amazon.com/gp/product/B007YWL3RQ/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
"XS Scuba Male 1/4" NPT Adapter"
IIRC the 3-way splitter is 3/8" NPT, so there's a 1/4 NPT - 3/8 NPT bushing -- meaning that the 3/8" outside is internally threaded to 1/4", so it adds very little overall length.
It was cheaper, IIRC, to do 1 adaptor to the splitter than to get 3 adaptors and such to go to the 3 fittings w/o the splitter.
Oh I'm sorry... I meant the 3 way splitter.
Oh ok. it's just a NPT splitter? Could you share a link? I couldn't find it under "npt splitter"