Fit perfectly. We really like the adaptability with the multiple rivets and Velcro. Glad I read the reviews and got 2 inches bigger than the back-flow valve. We will have to see how it stands up to the Colorado weather and sun.I used the item to cover the water softener bypass valve/water pipes that I had installed outside. It had a bypass valve located outside that I was unable to use during the unusually freezing weather last Feb. 2021. Even though a bypass valve is available, I think it would have froze anyway as it was located outside. Needless to say, I had no water for a week during that time. The originally-ordered item was unavailable so a replacement item was sent. It had a note stating to call them and to use the item as a temporary replacement. I was already returning item but gave them a second chance as the weather here in Texas was getting below 32F and I had to use the sent item temporarily. Denish (the distributor of the product) stated that I can keep the sent item and will send me the correct item once it became available. The product is advertised for use with the backflow unit (sprinklers) but I'm using it for something else. Anyway, he recommended using the same product for the backflow unit. He sent me an additional free backflow cover plus the correct cover that I both installed. The two items are customization so I was able to cover the other pipes and supports, positioned at different locations on walls. Did I tell you the backflow cover (in the pictures) was sent to me for free because of the backorder problem? I still have the temporary cover that he said I can keep. I say that "excellent customer service".Put this on in a matter of a minute or 2. Is water and uv repellant. Hope this lasts through the hot summer heat and uv rays here in Nevada.The product has held up to Colorado winters for a second season and I couldn't be more pleased. The rings in the side allow for quick ziptie application and the Velcro allows for perfect coverage over any weird angle. The bag can also be hosed and brushed off for cleaning and storage. I cannot believe we waited so long to purchase.This went on so easily over my exterior pipes. The Velcro at the openings works great and held up well in windy conditions. I’ve only used it during one hard freeze so far but it performed great.Used this to cover my Backflow Preventer. Perfect size for my needs. Search for the correct size by shopping multiple manufacturers / suppliers.This cover fits great on my sprinkler system. This cover is 20.5” with sides, so I would suggest to buy the cover with at least 2” more so it can cover the vacuum pressure system. It is made with a hard fabric and cotton with soft fabric on the inside, it also includes zip ties. I don’t know how good it is since the winter has not been as bad as last year.Appears durable, and was easy to install. Gave 4 stars instead of 5, because there was a card with it that indicated I won $5 Amazon gift card. Attempted to get it 3 different times off their website. As of today, no gift card?