This
is the original, non-vented cap. #172-12
No
longer available new, they can be hard to find
used as
well.
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This
is #172-14, a vented cap that can also be used. To be an
exact copy of #172-12 you would have to braze up the vent
holes in the underside. Using a vented cap on a non-vented
system may violate emission regulations, but as I have only
seen about 10% of the "evap" equipped 70's with an operating
system this point may be moot. Keeping the system sealed,
while some of the other aspects of the system have been
bypassed or removed can also create problems. This cap can
be buffed to look a lot closer to the #172-12
cap.
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