Grain can be susceptible to weevils and other pests and if fumigation is required, a range of options can be used. Polytex Tarpaulins suggest that if you are covering grain & require fumigation you use their grain bunker tarpaulin system with fumigation tarpaulin zips.
This new method of accessing grain minimises the time of fumigating and re-welding or patching Bunker Tarpaulins
Fumigation Zips are also great for taking Grain Samples prior to out loading.
Phone Polytex today for various references on the ease of use of Grain Bunker Fumigation Zips.