Thanks again John.  I was also searching, and found 
http://www.theoringstore.com/
(who knew?  What did we do before the internet???).

In red silicon, I ordered the following sizes:

SAE: 1/16 cross-section, 5/32 ID, 9/32 OD (I know this works--that's what the 
black ones are), minimum quantity 10 at $0.05 each (!)

Metric: 1.5mm cross-section, 3mm ID (no OD can be specified), minimum qty 1, 
ordered 3, $0.58 each
1.5mm cross section, 4mm ID (no OD can be specified), min qty 1, ordered 3, 
$0.58 each.

I ordered the metrics just because I'm curious, but obviously the SAE ones are 
dirt cheap and I now have a lifetime supply...

Shipping was $5.  Will report back when they arrive, as to which metric size 
was correct.  I measure the old ring at about 4mm, and the breaker at 3.5mm.

best,
bmc

Sent from my apple IIe

On Aug 22, 2014, at 7:28, John Brinkman <[email protected]> wrote:

> http://www.amazon.com/Silicone-O-Ring-70A-Durometer-Red/dp/B003SLE5LS#productDescription
> 
> Just need the size
> 
> Otherwise would try  a hydraulics company, that's where I ended up
> getting mine from.
> 
> JohnB
> 
> On Fri, Aug 22, 2014 at 4:18 PM, Benjamin McCafferty <[email protected]> wrote:
>> Thanks John.  Yes, the red is what I'm after.  My silicone one lasted about 
>> 4 years, the black ones are dying after a couple of months.  I'll post if I 
>> find it.
>> tx,
>> bmc
>> 
>> Sent from my apple IIe
>> 
>> On Aug 22, 2014, at 7:10, John Brinkman <[email protected]> wrote:
>> 
>>> The red one's are silicone o-rings and more resistant to high temp but
>>> don't seal quite as well as the black rubber ones as they are slightly
>>> harder.
>>> 
>>> JohnB
>>> 
>>> On Thu, Aug 21, 2014 at 4:28 PM, Benjamin McCafferty <[email protected]> 
>>> wrote:
>>>> Yeah, that's the point--I don't want to change them more often.  Will post
>>>> if/when I find the red ones.
>>>> tx,
>>>> bmc
>>>> 
>>>> 
>>>> Sent from my apple IIe
>>>> 
>>>> On Aug 20, 2014, at 18:14, Skip Lord <[email protected]> wrote:
>>>> 
>>>> Hey Ben, I have a B1 from '06 red one died been using the black ones ever
>>>> since have to change more often ???
>>>> 
>>>> 
>>>> On Tue, Aug 19, 2014 at 1:21 PM, Skip Lord <[email protected]> wrote:
>>>>> 
>>>>> Hey Ben, I have a B1 from '06 red one died been using the black ones ever
>>>>> since have to change more often ???
>>>>> 
>>>>> 
>>>>> 
>>>>> On Tue, Aug 19, 2014 at 10:48 AM, Benjamin McCafferty <[email protected]>
>>>>> wrote:
>>>>>> 
>>>>>> Hey, anyone out there have a size, part number, description, vendor for
>>>>>> the vacuum breaker o-ring?  I found one at the local hardware store, but
>>>>>> it's just normal black rubber and hardened quickly.  The one I found is 
>>>>>> 9/32
>>>>>> x 5/32 x 1/16; I'm guessing there's a metric equivalent that is even more
>>>>>> specific to the machine?
>>>>>> 
>>>>>> best,
>>>>>> Ben
>>>>>> 
>>>>>> Sent from my apple IIe
>>>>>> 
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