What is a washing machine supply hose?
Updated August 2026
The two hoses screwed to the back of a washing machine are its supply hoses, and they hold full household water pressure, typically 40–80 psi, every hour of every day whether the machine is running or not. One feeds hot, one feeds cold, both use 3/4-inch garden-hose thread, and both are usually 4 to 6 feet long. The washer opens its inlet valves for a few minutes per load. The hoses stay pressurized for the other 23 and a half hours.
Where it is
They live in the gap behind the machine, running from a pair of angled valves, often set in a recessed laundry box, up to the inlet ports at the top rear of the washer: red on hot, blue on cold. Walk the washer forward 12–18 inches and inspect three spots. First, the rubber right where it meets the crimped metal collar at each end. Second, the belly of the loop where the hose presses against the wall. Third, the valve stems, looking for green corrosion or a chalky mineral crust that means a slow weep. Rubber hoses carry a molded date stamp; anything before 2021 has already answered the question.
What it does
The job is boring until it is not. Rubber stiffens and crazes from the inside over years of pressure and temperature swings, and the ending is rarely a polite pinhole. The hose splits down its length or blows off the crimp, and a 1/2-inch line at house pressure moves several hundred gallons an hour until somebody comes home. That is why a $10–20 part gets this much attention: insurance industry figures put the average homeowners water-damage claim in the $10,000–15,000 range once drywall, flooring, and cabinets are counted, and a hose that lets go on the second floor takes the ceiling below with it. The bill for skipping the swap is wildly out of proportion to the part.
Maintenance
Replace rubber supply hoses every 5 years and braided stainless every 5–10, and immediately at the first bulge, rust ring, or damp fitting. The upgrade is cheap: braided stainless runs $10–20 a hose and goes on with two adjustable wrenches in about fifteen minutes. Two habits carry the rest. Close both valves before any trip longer than a weekend, and leave enough room behind the machine for the hoses to curve instead of kink. The full replacement interval and the surrounding routine sit in the supply hose maintenance checklist.
What it costs to replace
A replacement washer supply hose runs $10–20 each for braided stainless, or $150–300 for a plumber to swap both and add a single-lever shutoff.
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Frequently asked questions
Are braided stainless hoses actually better than rubber?
Yes, with one caveat. A braided hose is the same rubber core wrapped in a woven stainless jacket that stops it from ballooning and blowing off the fitting, and it tolerates far higher pressure. It is not immortal: the core still ages and the braid can corrode at the collar in a damp laundry room. Treat 5–10 years as the window. Over finished space, spend the extra on flood-safe hoses with a flow-sensing shutoff, about $25–40 a pair.
Should I shut the washer valves off after every load?
It is the textbook answer, and almost nobody keeps it up, partly because old multi-turn valves seize or start weeping once you exercise them weekly. Try the practical version instead: fit a single-lever ball valve box, $50–100 in parts, so both lines close in one motion, then use it for vacations and long weekends. For daily coverage, a leak sensor under the machine at $20–30, or an automatic shutoff valve at $150–400, watches the room for you.
How long do washing machine hoses last?
Manufacturers rate rubber hoses at 5 years and most warranties assume that number. Real-world failures cluster between year 5 and year 12, and the early ones are almost always hoses kinked against a wall or feeding a machine that walks during spin. Our page on how long a washing machine hose lasts breaks the range down by type. The field trick is simpler: write the install year on the hose jacket with a paint pen the day it goes on.