This is Atlantic Water Garden"s SN2800 AWG Black Silicone 2, 8 oz tube, We have a large selection of Installation Tools/Plumbing and other water features from Atlantic Water Gardens, Black RTV silicone sealant is used to create a watertight seal where liner is attached to filtration components, Permanently flexible RTV silicone used in conjunction with Atlantic"s molded-in inserts, liner retention flanges and stainless steel hardware ensures a watertight connection every time, SKU: ATLWG411