From the product description, check product page for current description, price and availability:

• This beer bottle filler is made of premium 304 stainless steel, anti-rust, corrosion resistant and with long life.
• Insert into the bottle in the off position, then turned to CO2 to flush the bottle and then to beer for filling. Quick and efficient way to bottle beer directly from your kegs, there will be no sediment at the bottom of the bottle.
• The adjustable pressure relieve on the side of the unit allows you control the speed of fill by adjusting the pressure in the bottle.More effective purging of oxygen and no foam during the filling process.
• Features a special valve that allows CO2 and beer to flowdown the same stainless tube, directly to the bottom of the bottle.
• The goal for counter pressure bottle filling is to store your beer in the most sanitary environment. Note: Make sure your keg is kept cold, or it will have foaming issues.

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