Hello, another possibility, but not with peacock model, (peacok is different than next model, the oprv hole is close from the body , there are not enough distance from the body to place a splitter), is using a splitter with an octo downstream valve. Like this, the octo downstream valve is also the oprv.
That's a very slick way to do it, Fred. Is that splitter metric?
Standard splitter all in 3/8.
On all snark, that I owned the lp oprv port are in 3/8
My Snark IIIs and Silvers have OPV ports that are M10x1.0. 3/8 x 24 is very close, but threads are slightly coarser and the diameter is slightly smaller at 9.45mm (10mm male end on fitting measures at 9.86mm). A 3/8 x 24 fitting screws into mine, but it is very loose. Are you positive yours is 3/8"?