u003cemu003eTo help distinguish Centerfire diffusersu003c/emu003e with the new internal stop, users can check the orientation of the roll mark. In original style diffusers, the roll mark is readable when the tip end is at the top. In diffusers with the new internal stop, the roll mark will be readable when the neck end is at the top.u003cbr/u003eu003cbr/u003eu003cimg alt=u0022Group of two Centerfire diffusers, highlighting the roll marku0022 src=u0022https://www.tregaskiss.com/wp-content/uploads/2020/07/centerfire_diffusers.jpgu0022/u003eu003cbr/u003eu003cemu003eu003cspan class=u0022has-inline-color has-cyan-bluish-gray-coloru0022u003eFigure 2u003c/spanu003eu003c/emu003eu003cbr/u003eu003cbr/u003eu003cemu003eTo help distinguish Quik Tip diffusersu003c/emu003e with the new internal stop, users can check the roll mark. In the original style diffusers, the roll mark has one Bernard starburst stamped before the part number. In diffusers with the new internal stop, the roll mark will have a Bernard starburst stamped before AND after the part number.u003cbr/u003eu003cbr/u003eu003cimg alt=u0022Group of two Quik Tip diffusers, highlighting the roll marku0022 src=u0022https://www.tregaskiss.com/wp-content/uploads/2020/07/quick_tip_diffusers.jpgu0022/u003eu003cbr/u003eu003cemu003eu003cspan class=u0022has-inline-color has-cyan-bluish-gray-coloru0022u003eFigure 3u003c/spanu003eu003c/emu003eu003cbr/u003eu003cemu003eu003cbr/u003eFor both Centerfire and Quik Tip diffusersu003c/emu003e, a second simple method to check for an internal stop would be to insert a liner into the diffuser. If the liner will not pass all the way through the diffuser, then an internal stop is present. These internal stops have been added to allow for the use of a QUICK LOAD liner AutoLength system with all consumables and handle styles in the BTB MIG gun platform.u003cbr/u003eu003cbr/u003eu003cemu003ePlease noteu003c/emu003e that regardless of whether you are using the QUICK LOAD liner AutoLength system or not, it is still important to understand which diffuser you are using as this affects liner trim length during replacement. Please refer to the insert inside your diffuser bag for liner replacement and trim length details.