Abaqus Contact Definition

Hello,

I am having a trouble about contact definiton in my model. There are 3 piece and 1 piece is constant (Plastic) and I need to define proper contact between gasket (rubber) and plastic. When I push the pipe there is a penetration between gasket and fitting. This is not realistic. I have been using the general contact definiton. Is there anyone who has opinion about this issue? Thanks.