Width of double 100's

[Rose Robinson]

Both XS-Scuba and Thermo specify 215mm centers. Thermo makes a narrower isolation valve for 190mm centers or 7.48031". Both make up to +/- 5 mm or 0.2". These dimension are consistent with manifolds in my shop that I measured with digital and dial calipers.

I'm not doubting you,

My manifolds are set at 8'' center to center.

Both Thermo manifolds, new in 2010, same as my OMS bands, my original tanks of the same vintage were replaced with new Faber's in 2018. original tanks were Canadian made Worthington, who no longer manufacturers scuba tanks.

My manifolds could be adjusted to a wider center to center, 8.5 inch for sure, but this dimension would be too wide for my OMS bands.

Rose.