What type of rigid spline to use for pet screen

Thanks for contacting us. I'm afraid we do not carry a rigid screen spline that can work with pet screen. The issue is that the flat channel that the 55-109 (and similar rigid splines) go into cannot hold the thicker screen. Regular splines can, but they can't fit in that flat channel. You would need a screen made specifically to use this kind of screen. I am sorry we cannot be of more help.