Aquascape Signature Skimmer Check Valve Adapter by Aquascape $ 6.29 1 2 3 4 5 6 7 8 9 10+ Quantity Quantity Add to cart Adapter for Signature Skimmer 2-inch check valve assembly Allows Signature Skimmer 8.0 and 6.0 connection to 2" Check Valve Assembly. Item number: 29511