I use a combustible mixture: Paraffin oil, smell and smoke free, slow-burning, non-flammable (flash point at 85° C) The valve is filled with glue, you never in its life can not open, even the biggest key what you can find (This is for those who are afraid someone will open the valve) If you would like to help support the creation of these videos, then head on over to the Banjo Show Patreon page: https://www.patreon.com/user?u=5557620 Get access to the list of materials and more information on creating this project: https://www.patreon.com/posts/list-of-for-oil-14959290 Social Media: • Facebook: https://www.facebook.com/Banjo-Show-355972981468583/ • Instagram: https://www.instagram.com/banjo.show • VK: https://vk.com/public142532391 • ETSY: https://www.etsy.com/ru/shop/SteampunkPipeStore?ref=hdr_shop_menu#policies