House Regulator

I have a leak in a pipe that is outside my house. It is a 5 year old copper 1/2" pipe. The leak caused a ?

severe reduction in water pressure all over the 1250 sq.ft. house. My
plumber says that I need a water pressure regulator. I don't know what
that is. Can someone explain it to me. My plumber says $600.00.

Fix the fricking pipe!
$15.00

Seth Thomas Regulator School House Clock Key Wind Clock 8 Day Clock Works
Seth Thomas Regulator School House Clock Key Wind Clock 8 Day Clock Works
$19.99
Time Remaining: 2d 10h 26m

Seth thomas Regulator School House wall clock New Oak
Seth thomas Regulator School House wall clock New Oak
$175.00
Time Remaining: 4d 6h 22m
Buy It Now for only: $199.00

Seth thomas Regulator School House wall clock New
Seth thomas Regulator School House wall clock New
$175.00
Time Remaining: 4d 6h 22m
Buy It Now for only: $199.00

vintage paper school house regulator clock faces lot
vintage paper school house regulator clock faces lot
$0.99 (1 Bid)
Time Remaining: 5d 3h 34m

REGULATORPENDULUMSCHOOL HOUSE WALL CLOCKCHESNUTNEW
REGULATORPENDULUMSCHOOL HOUSE WALL CLOCKCHESNUTNEW
$21.94
Time Remaining: 15d 9h 41m
Buy It Now for only: $21.94