The answer to 'lifespan of supply line' is that the average lifespan of a plumbing supply line is 8-12 years, but this can vary depending on the materials used and the water quality in your home. Supply lines are the flexible hoses that connect your faucets, toilets, and appliances to the main water pipes. Over time, these lines can become worn, cracked, or corroded, increasing the risk of leaks and water damage.
Higher quality supply lines made of stainless steel or braided stainless steel tend to last longer than basic plastic or rubber lines. The water chemistry in your local area can also impact the lifespan - hard water or acidic water can degrade supply lines faster. Proper maintenance, such as checking for leaks and replacing lines at the first sign of wear, can help extend their lifespan as well.