"I had this flange and a Salamander flange in my hand and this one is far better. It is easily adjustable so that the horizontal (vent) outlet points exactly where you want it. The pump outlet is on the top. Best to solder onto the horizontal outlet as it is close to the top of the cylinder. Generally need this 1" flange for new cylinders but there is a 3/4" one available. Can't comment on reliability as only just fitted."