Guarding Against Rising Treatment Costs - S.S.I. Manhole Inserts Now you can stop the unwanted inflow of rainwater through manhole covers with strong, durable Manhole Inserts from S.S.I. The manhole cover inserts are custom sized to provide an enhanced fit and seal and are manufactured from ultra-high-density polyethylene copolymer material known as Marlex HXM 50100.

Sealing Systems, Inc. - Aqua Seal Sealing Systems, Inc., an international manufacturer, and distributor of quality products for sustaining and maintaining municipal water and sewer systems by preventing inflow and infiltration. Their product line includes chimney seals, joint wraps, chemical grout, manhole adjustment rings (HDPE & Rubber Risers), and manhole inserts. SSI - Protecting your infrastructure from inflow and infiltration for over 20 years!