Diesel heater exhaust plug, webasto cover

I have made my own version of mobile diesel heater box. 

I needed something to protect exhaust when heater is being stored/moved or simply not in use.  I have created this simple plug from TPU. 

It works perfect for either marina type heater thru hull exhaust or muffler which is standard for most of the heaters. 

Print from TPU with standard settings. Plug has small hole for chain/clip or keyring to attach to something when not in use. 

Please use this plug ONLY when exhaust has cooled down. Do not insert plug into hot diesel heater exhaust.