These tubes have a single or dual gridline to dome perc.  I ususally put the dome perc about 2 inches above the main perc.  The dome perc comes with either a spike as shown, or a small matching color ball (you can email me which you want or the default is a ball). These double perc tubes really function!

Each Piece is made to order.  Current lead times are on the home page and can be confirmed by email (OK), text (BETTER), or DM on Instagram (BEST).