PST E7 Vs E8

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MacLeod

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Now that the former Pressed Steel HP and LP have the same Spec. DOT rating (E-9791), and same neck thread, what would be the reason for choosing either the E7 or E8 over the other...particularly say the E7-120 VS the E8-119...when the dimensions are so similar?


E7-120 3442 psi D:7.3 L:28.00 Wt:36.6 -1.3 -10.3 3/4-14
E8-119 3442 psi D:8.0 L:24.00 Wt:39.3 -0.5 -9.5 3/4-14
E8-130 3442 psi D:8.0 L:25.56 Wt:42.2 -1.8 -11.55 3/4-14

Taken from Lloyd Bailey's site:
www.lloydbaileysscuba.com/PST E Series Tanks.htm

(I tried to give columns headings but no matter what I did, "preview" shows the columns completly messed-up...6th and 7th column is Buoyancy Empty and Full...8th column is Neck Thread)
 
https://www.shearwater.com/products/perdix-ai/

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