Trelleborg 160 is a one-piece integrated seal that is cast into the socket during manhole manufacture. It is specifically designed for use with the spigot design according to DIN V 4034-1.
Having this seal integrated in the concrete means you will always have the right seal in the correct place:
Forming part, made of hard rubber (63 IRHD) ensures a secure and accurate joint profile during casting
Sealing part, made of soft rubber (40 IRHD) is a combined lip and compression seal. This rubber has excellent flexibility to take up irregularities in the spigot surface
Retaining sections are cast into the concrete during pipe manufacture and secure the seal in the correct position
Slurry lips seal against the base ring (pallet). This prevents concrete ingress during manhole manufacture. The lips are made of soft 40 IRHD rubber which gives an excellent seal against the base ring during casting