how to access the inside of fuel tank on chevy colorado diesel 2017

i have bought Fitch Fuel Catalyst, drop in pellets. for 20 gallons, you use 8...which i have. but all new vehicles have the anti spill/siphon screens.
Does anyone know a way i get them in tank? This stuff is not snake oil...it really works. the reviews are good on it, if interested.
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