Water Shut-Off Valve Repair & Replacement on O'ahu
A shut-off valve that won't close is a serious problem — it means you can't stop water flow in an emergency. Corroded, leaking, or stuck valves are one of the most neglected maintenance items in older Hawaiian homes. Alpha Omega repairs and replaces all types of shut-off valves across O'ahu.
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What We Do
Valve Services We Provide
From the main shutoff at the street to the angle stop under your sink — we handle every valve in your system.
Main Water Shut-Off Valve
The main shutoff controls all water entering your home. Ball valves are the modern standard — they close fully with a quarter turn and don't corrode like older gate valves. We replace failed or stuck main shutoffs without major disruption.
Fixture Angle Stops (Under-Sink Valves)
The small valves under sinks, behind toilets, and feeding dishwashers and washing machines are called angle stops. These corrode and fail with age — especially in Hawaii's humid environment. We replace them before they leak or seize.
Gate Valve Replacement
Old gate valves (multi-turn round handle) are unreliable — they corrode internally and often can't fully close when you need them. We replace gate valves with modern ball valves throughout the home.
Pressure Reducing Valves (PRV)
A pressure reducing valve controls the water pressure entering your home. A failed PRV can cause high pressure that damages fixtures and appliances. We test, adjust, and replace PRVs to keep your system at the right pressure.
Irrigation & Hose Bib Valves
Outdoor hose bibs and irrigation shutoffs take more abuse than interior valves and fail more often. We repair dripping outdoor faucets and replace seized shutoff valves for irrigation systems.
Commercial Valve Replacement
Commercial properties have extensive valve systems throughout the building. We service and replace shutoffs, isolation valves, and zone valves for multi-unit buildings, offices, and commercial facilities.
Don't Wait
Signs Your Shut-Off Valves Need Attention
Main or fixture valve won't close completely when tested
Valve handle is corroded, broken, or difficult to turn
Water dripping from the valve stem or packing nut
You don't know where your main shutoff is or can't access it
Home has original gate valves (older multi-turn round handle valves)
Angle stops under sinks show rust, corrosion, or mineral deposits
You experienced a plumbing emergency and couldn't shut off the water
Water pressure seems higher or lower than it should be
Common Questions
Frequently Asked Questions
How often should I test my shut-off valves?
Once a year is a good practice. Turn each valve fully off and then back on. If it's stiff, leaking from the stem, or won't fully close, it needs service. A valve that hasn't been turned in years is often seized and unreliable when you actually need it.
What's the difference between a gate valve and a ball valve?
Gate valves use a threaded stem to lower a gate into the waterway — they require multiple turns to open/close and corrode internally over time. Ball valves use a ball with a hole through it that rotates 90 degrees to open or close — they're faster, more reliable, and don't degrade the same way. Modern code prefers ball valves.
Can you replace a valve without shutting off the whole house?
For fixture-level valves (angle stops), sometimes yes — if there's an upstream shutoff that isolates that section. For main shutoff replacement, we coordinate with the water utility to shut off at the meter, do the work quickly, and restore service the same day.
My valve is leaking from the handle — is that serious?
A stem leak (dripping from around the valve handle) means the packing material is worn. It often starts as a slow drip but can worsen quickly. It's an easy repair when caught early, but left alone the leak grows and can damage the wall or cabinet.
Don't Wait for a Valve to Fail in an Emergency
Knowing your shutoffs work before you need them is peace of mind. Call us to inspect and service your valves anywhere on O'ahu.