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Change in Beckett AFG specs for Mega Steam MST 396 ?

USA498 Member Posts: 45
Browsing Beckett's OEM Spec guide and noticed two entries for the Megasteam MST 396. They have a pre March 2013  and a post March 2013. The newer setup has the pressure bumped up to 180 and of course a smaller nozzle.

Why would they do this and which one should be used.

<span style="text-decoration:underline;">Pre March 2013</span>:

Burnham AFG L1   3-3/8"   0.85 X 60º B  150psi  S-7 / B-12"

<span style="text-decoration:underline;">Post March 2013:</span>

Burnham AFG L1   3-3/8"   0.75 X 60º B  180psi  S-9 / B-02"
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