It is but if you had the thinner (original) feed-tube, you'll have to take the plastic piece loose that it goes through and expand the hole to 1/4 inch (I believe).
1/4 drill bit is the way to do it but the plastic block will need to come out to do this. I too have upgraded to the larger tubing- well almost....when I get home I will be "fixing" my Grand the the update!!
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