I am getting ready to order a Calimar 3hp VS Pump. In the description it states: Port Size 2" x 2". However my plumbing is all 1 1/2". Can I still use this pump? Is there an adapter I can order to make this work? Sorry if this is a stupid question - my husband is our of town and I'm trying to get this ordered so it will be here when he gets home and can install it.