[BarryinMN]

Check valve in "A" port in the third circuit. Restrictor fitting (0.045" orifice) installed in the P1 inlet port can easily be removed, restricts flow to all three "A" ports.

This text leads me to think the valve is 3 individual 1 way ports.

P1 oil input
P2 oil return to tank

A1 grapple close > B1 exhaust

A2 grapple open > B2 exhaust

Don't see how it works without a diverter - but if the manufacturer says it works - the text must be wrong & the valves in reality are 2 way.

Can you hook up some 12v wire & use an air compressor to blow some air thru and test for 2 way valve action??

Simpler than hooking up a bunch of hyd hoses.