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[LittleJohn]

Check valves, are typically required when using Mulitple pumps; however and this is the BIG KICKER - dependant upon hydronic design.  Looked up pump curve for 15-58 & they show that there is a slight decrease in GPM across the curves, but the lines are nearly on top of each other - other than when running in High, then its maybe 1 GPM with check valve in.  Do the math and look at the pump curves

NOTE: If the pump is always ON, as main pump off of boiler - then I would think that the check valve is not required.

[cgbm]

I know this is a little late, but I figured out a non-distructive way of removing the little white plastic piece.  Place a large flathead nail in a pair of Vise-Grips and hook the head of the nail under the white piece.  Mine came out with a good tug and I can now reuse it.  You may not need to use the Vise-Grips, but it gave me something more substantial to hold on to.