Ball Check Valves????

[ronau]

Thanks for the replies guys.

Quite honestly I probably don`t need any check valves but redundancy is always good. My tank is 70 gallons and my sump is 55 gallons. I am going to use 2 90° loc-line elbows to bring my return up and then barely back down into the water so it should break the siphon very quickly in the event of a power failure. I bet I could flow 15 gallons back to my sump without a problem but I guess we`ll see when I get it plumbed and tested.

Thanks again guys.