My water pressure is very low from the original install is there a way to adjust the faucet to allow a better pressure flow

remove and check the screen in faucet for debris as to that your valving is probable much smaller than old one and not going to be able to adjust

From what are you experiencing low water flow?
is it from an outdoor faucet?
indoor? Kitchen or bath?
bathtub or shower?
or do you have some other kind of spigot that is low flow?
Has it always been low flow?
Or, did it just start showing this symptom?
Is Low flow present at all faucets? Or just the one?
many questions... Because you were not specific! We would like to help, but we can help you better to get to a solution when the questions are not so basic!
If you have always had low water flow, throughout, then your supply is restricted at the main. If just one termination point, then it is possible the restriction is right there at that faucet,

clevine336-

The design of a hand sprayer is meant to provide a higher pressure spray (the smaller outlet size means greater velocity in the water coming out of the sprayer head). That said, there could be something constricting the water flow in your faucet. If you unscrew the aerator on the end of the faucet do you get better pressure? Is the screen in the aerator clogged with sediment or mineral deposits? If this is the case you may have water requiring periodic cleaning of the aerator.

Hope this helps.

Regards,

DIYpro

Before calling service technician, open following link for Rheem troubleshooting resources.
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html

List of causes MIGHT include one of following:
Bad household circuit breaker that powers electronics, or loose wire inside outlet where tankless plugs in.
Tankless fuses and control board.
Water flow rate too low. Minimum .8 gallon required (depending on model)
Tankless inlet filter clogged.
Household aerators clogged at faucets.
Crossover at single-handled faucet
If installed, there can be crossover at mixing valve.
Faulty household check valve, including check valve on re-circulation system if that system is installed.
Restriction in household water line, such as clog at elbow.
Unequal pressure in household hot and cold lines, caused by restriction in hot line. When single-handled faucet turns on, the cold water pressure is higher so hot does not flow and tankless will not turn on.
Loose wire connection inside tankless.
Unit temperature set too high.
Unit temperature set too low.
Water temperature is very hot coming out of tap, so more cold is added, but that reduces amount of hot water flow, so tankless turns off because flow rate is too low.
On some tankless, if water is preheated by solar or other indirect source, the burner will not activate.
High mineral content in water > delime tankless yearly
Misaligned temperature sensor
Low gas pressure. Wrong type of gas. Undersized gas line.
Too many faucets on at same time.
Faulty tankless water valve. Water valve stuck.
Fluctuating household water pressure, for example MUD and PUD district water pressure problems or water well pressure.
Faulty household pressure reducing/regulating valve if installed.
Faulty household pressure tank, if installed -or- pressure tank needs to be installed.

One thing you could try is to remove the aerator at the end of the spout on the faucet, Turn water on and see if pressure is any better. If so the aerator is got something in it restricting the flow.
You also can remove the dime shaped flat in the aerator to increase water flow. It looks like a dime with a hole about 1/8" in center to restrict the flow to about 1.6 gpm. Remove it and reinstall aerator and check water flow

Most of the times when cold and hot side of faucet.It would be the first thin to check being you have good water pressure at other faucets. They catch debris and the flow slows down from the faucet's. Check out supply lines and faucet for a blockage if this doesn't take care of the problem.

Check out this web sire for a parts breakdown of parts in faucet. Check out installation and rough in sheet for information on faucet below.
http://www.needplumbingsupplies.com/Kohler-Kitchen-Sink-Faucets.asp?id=3628

Every faucet and shower have a water saving restricter in them. Remove them from the shower head and end of the faucets.
They are about the size of a dime and with about 1/8" hole in them in which water flows out. So the flow is getting restricted from 1/2' flow to this giving you a water saving about a 1.5 gpm.

Below is some more information for the web site please check it out for further help.
http://www.inspectapedia.com/water/Poor-Water-Pressure-Diagnosis.htm
Poor water pressure just at certain plumbing fixtures? poor cold water pressure, hot water pressure, or both hot and cold water pressure or flow that is observed just at some plumbing fixtures in a building while flow and quantity are good at others suggests that the water flow or pressure problems are local to certain runs of supply piping or to the specific fixtures. Check the following first:

1. Clogged aerator or strainer on sink faucets - clogging by dirt, debris, corrosion, can significantly reduce both hot and cold water flow at a sink where the strainer needs cleaning or replacement. Unscrew the strainer from the faucet and turn on the water - if the fixture pressure or flow is much better you've probably found the problem.
   
   Look at the aerator/strainer: inspect it, clean it, perhaps soaking it overnight in vinegar to remove corrosion and mineral build-up, or just install a new aerator/strainer.

While not always the case, low flow is usually caused by a plugged aerator. The aerator is the device that softens the water flow as it comes out of the faucet. Unscrew it, remove it, and clean any debris out of it.

Before you put it back, turn the faucet on briefly to flush any other debris out and to see if the water pressure is better. If not, there could be a cartridge (if equipped) issue of some piping problem.

yes it should have a flow restrictor in the end of the spout. You might need to clean it out

Verify the height from the shower valve to the Shower head, the instructions specify the correct distance if it is too short the pressure could be getting up to the shower head.

Perhaps the water pressure it too high at the valve not allowing all the water down the faucet outlet, there are set screws on the sides of the shower valve to adjust the water allowed in the mixing chamber.

Something is restricting the water flow to the faucet, creating enough pressure to send some of the ater supply up to the shower.

I hope some of these ideas help