Testing Valve Facing Materials for Primary Poppet-type valves by John A Tuttle from Player-Care.com

[@jimthesoundman8641]

It's always good to see a video from you John, keep going, you are one of the few resources we have left for this sort of stuff.

[@toiyabe2]

John, just great your examination of materials and sharing you knowledge.....thank you!!!

[@philhugill8458]

WERE ANY ANIMALS ABUSED MAKING THIS VIDEO ???