The new Bernard conventional liner is installed in the same way as the older style conventional liner. u003cemu003ePlease be sure to note the proper trim length which will vary based on your choice of diffuser or retaining headu003c/emu003e. Further, Centerfire and Quik Tip gas diffusers have new internal stops in them; this means that trimming will now require the removal of the retaining head and trim lengths will be different.