Hi nickjacob, Depending on which model you have (?), it may have threads at the discharge of the pump, or it's just smooth.

If it's threaded, you can run pvc. You would need a 'female adapter' to go on the pump.
http://www.homedepot.com/h_d1/N-5yc1v/R ... reId=10051

If it's smooth, tubing will slip onto it. The tube 'could be' run to your grow bed, Or you can swithch over to pvc. To do that, you'll need a 'barb adapter'. The adapter slips intothe tube and screws into a female adapter.
http://www.homedepot.com/h_d1/N-5yc1v/R ... reId=10051

As far as what size tube or pvc...? The box should state the size of the discharge , or measure it, or just carry the pump to HD, lowes, ace, ect and do a test fit.