If you notice, all of the faucets in your house discharge water above the rim of the fixture, and they do not have a threaded connection for a hose. Your outside hose bibbs are designed to connect a hose. When you use a hose, there is always the possibility for a negative pressure to develop and cause water to backflow into the house and contaminate the potable water. This is the reason that the plumbing code requires a backflow prevention device on all outside hose bibbs.
In my opinion, the best way to avoid the splashing is to install a second valve, similar to the one shown in Post No. 11. This will prevent splashing and it will not compromise the backflow prevention device.
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