With a stem style faucet a neoprone valve seat and spring fits into the water inlet port in valve body.
Delta arabella kitchen faucet leaking.
The handle then fits onto the top of the stem.
Replace o rings 1 in diagram repair part rp2055 leaks from aerator.
Replace stem unit assembly 3 in diagram repair part rp1740.
Replace stem unit assembly 3 in diagram repair part rp1740 leaks from base of the spout.
Leaks from under the handle.
Leaks in this type of faucet usually can be fixed with a new neoprene valve seat and spring.
Replace the hose if it is damaged or leaking.
If this occurs check the connection of the hose to the spray wand.
For faucets purchased prior to 2007 please order rp1050 cap and rp61 cam and packing.
Replace seats and springs 4 in diagram repair part rp4993 if leak persists.
Replace ball assembly 1 in diagram repair part rp70 as shown for lever handles or rp212 for knob handles replace cam packing 2 in diagram repair kit rp61.
If this connection is secure and not leaking then check the hose for damage.
Over the valve seat and spring the stem is held into the body with a bonnet nut.
Delta single handle ball valve faucets are among the least troublesome to repair although the fact the valve is spring loaded can make disassembly a little finicky.