This fits really well to the space in the P1S and makes it easy to lift out nd remove the debris. Cut outs for the rods and screws are well positioned.
I do wish the P1S had a flat, raised base like the H2D, without the lip under the door that catches debris. On the H2D you can just sweep the stuff out through the door so the diaper is unnecessary. Sadly the P1S has the lip on the door frame so stuff accumulates under there, makng the diaper a great solution.