Mar Mac SurSeal... 

1. Provide a minimum 3/8" space between the frame and top adjusting ring or cone, with two rows of ¾" x ¾" preformed butyl rubber rope.
2. To insure a proper seal, clean the edge of the manhole casting and the vertical portion of the cone with a wire brush and remove any resulting residue from the surface. Sealing areas need to be reasonably free of gross imperfection (some imperfections may require the use of butyl rubber caulk as a means of creating a smooth, sealable surface.)
3. Pull the SurSeal ™ rubber collar over the manhole frame/chimney. Align the top edge of the collar 1" above the manhole casting flange and position the bottom preformed gasket so that it is centered a minimum of 1 ½" below the top of the concrete cone section.
4. Fold both top and bottom edges of the collar back and remove the release paper from the bottom pre-formed gasket. Flip/turn the bottom edge back into position.
5. (Top of gasket) Install the extruded gasket ("C" profile) by pulling it over the manhole frame. Press/seat the gasket 360° onto the edge of the flange making sure there are no twists in the material. Unfold the collar to cover the gasket. Center the C-shaped compression band around the edge of the frame's base flange with the gear nut facing to the right. Tighten securely with a 5 / 16" socket drive
6. (Bottom of the gasket) Center the flat band on the pre-formed gasket and tighten securely with a 5 / 16" socket drive. Tighten the band securely to achieve ± 50% compression of the sealant.
   Do not over-tighten