I had to replace my old pump, and I got a Hayward SP1580X15. The connectors on my hoses will not fit on this pump because it has internal threading for both connections. The old pump had a hose with an O-clamp holding in on for the skimmer. I think I can use a Hayward SPX1091Z7 to connect the hose from the skimmer to the pump with the old hose. The one I can't figure out is the hose to the sand filter. It is a stiff, plastic hose with a moveable plastic part that attaches the hose. It is one of the connectors that you turn by hand. The old pump had external threading that this attached to. After looking for several hours online, I could not an adapter to convert this from internal threading to external threading. Has anyone had this problem before? What part, if any, can I get to fix it?