Will I lose any pressure or flow?

You may lose an (very small) amount of pressure using an EZ-FLO in other words not much.

This favourably compares to 20 to 30 psi for a $35.- venturi system above all EZ-FLO is the solution for fertilising drip or soaker hose systems,  there is no other fertigation technology that can service such low flows and pressure.

EZ-FLO is designed to maximise pressure and flow.