49022 NELSON SCREEN TYPE SPARK ARRESTOR / SOUND DAMPENER Onan NOS 4872528 U.S. patent FITS 1.25" OD PIPE IF YOU MOUNT ON OUTSIDE OF PIPE OR FITS 1-3/8" ID PIPE IF YOU MOUNT INSIDE PIPE. MOUNT WITH SCREEN CONE TO THE INSIDE As an additional advantage, the screen acts to soften ?after bang? which can occur when an unburned gas mixture ignites in the muf?er after the engine is stopped. The ?after bang? condition is common with small horsepower engines as used with lawn and garden equipment. Please look at my other items in my STORE and add me to your favorites list. Click on See all Categories for additional products. I have thousands of other Onan parts available that have not been listed , yet. Please inquire and include your Onan engine model and spec number when doing so. ... Cheers, Mike Please look at my other items in my STORE and add me to your favorites list. Click on See all Categories for additional products. Cheers, Mike Powered by Turbo Lister The free listing tool. List your items fast and easy and manage your active items. 11-3-21