10000 PSI Fitting, SPX COUPLING 1/4 NPTF F 3/8 NPTF F

This SPX fitting is designed for use with Power Team high-pressure hydraulics, specifically at pressures up to 10,000 PSI.

You're reading it correctly. Both connections are female, one being 1/4 NPTF and the other 3/8 NPTF, so this coupling steps up between those two thread sizes. It's rated for working pressures up to 10,000 PSI, which puts it in line with Power Team high-pressure hydraulic equipment.

For adapting between those two sizes, this coupling gives you 1/4 NPTF female on one side and 3/8 NPTF female on the other, and it is intended for Power Team high pressure hydraulic setups up to a 10,000 psi working pressure.