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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"
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"
0
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