I have a Pegasus kitchen faucet and the sprayer has always had very low pressure.

Does the sprayer has an Aerator installed if it does remove it turn on the water if good flow clean the screen and install the Aerator, if no Aerator installed disconnect the sprayer from the hose try and see if good flow then you need to clean and install the sprayer, if that will not help get back to us, Thanks.

John