You're right, but the OP will need to get the tube and syringe and the best place to get them is at the vet. FWIW, when I give fluids, I use a size 18 french, but when I give food, I use a 30 french.
The syringes (in a wide range of brands/sizes) can be obtained via eBay, for those not in immediate need. Also, if 14 french would be sufficient? Male 16" catheters are dirt cheap (lookin' into the possibility of treatments from the other end ~'-)
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