1.With special tools installation:

The pressure is directly to the O-ring.As shown,the special tool between the metal floating ring and the rubber ring is mounted in the direction of the seat hole,the rubber ring is pressed evenly into the hole.

2.Other methods of installation:

An auxiliary O-ring between the conical annular surface of the floating oil seal and sealing O-ring is attached(see figure).The ring of the floating seal evenly by the pressure and the auxiliary O-ring clamp the O-ring is applied to ensure the other correct installation position.