3/8" Vinyl Tubing is generally used for transfer or racking (siphon.)

1/2" Vinyl Tubing is generally used for transfer or racking (siphon.)

1/2" Thick-wall Vinyl Tubing is typically used for pump intakes to reduce crimping and ensuring a steady flow.

3/4" Vinyl Tubing is great for use with the self-priming wine pump.