Personally i use a gardiners push fit valve and hold it in the palm of my hand,i've done it this way for about 5 years.I can't see anything that beats this method.You have fingertip control,there is no added weight or length,its relatively cheap and when used with the black barb to stem fittings,there is nothing to go wrong.With a little practice you don't even notice you are holding it,it becomes so natural.