This is an exact replacement for an identical 12-year-old Weber Adapter Hose I purchased in 2011 for use with our Weber "Q" grill to use a large tank, saving the cost of buying so many individual propane canisters.
After 12 years of weekly 3-season use, our Q grill is still in great shape, but the old rubber adapter hose became rock-hard with age and began to leak at the grill connector end.
 
I was thrilled with the extremely fast shipping and delivery of this item! I discovered the leak on a weekend, placed the order that night, and had the replacement hose in my hands by midweek. The replacement cost seems a bit high, compared with other 'knock-off brand' adapter hoses, but when amortized over a decade or more of future use, there's no point in risking my safety with an inferior product to save a few dollars.