Viton, fmk.wanted for hose quick connects, not necessarily nozzle quick connects. I’m just too tired to think today, sorry.
If you are talking for your nozzles it is 1/4". I get mine from Dultmeier - part # kh125v - 1/4 vinton o-ring.
What you have posted looks right - the outside diameter is 3/8" and the inside diameter is 1/4".
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I was looking for the 3/8 quick connectsin viton. I found some, a pack of black viton 1/2in outer diameter, 3/8inner diameter $5 for 100. Yep $5 for a hundy… 1 Lincoln…5 bucks…
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Never seen black viton o rings, always brown in my experience.
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Chinese also make o rings along with steel and other products. Keep that in mind. Lol
You can buy em at Lowe’s in the plumbing section in a pinch. #8 for lances, #10 for hoses.
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Lol,I’m bookmarking that. I’ve always used a hydro shop or Napa in a pinch. Thanks Pressure
Yep! I don’t know/don’t think they’re Viton but they last me long enough to where I’ve never thought “hmm that didn’t last very long.”
Yeah. When I first started out ,I was pinching pennies. Now I have 3 of everything big ,and 100’s of vitons of multiple sizes
243 reviews and only 2 1stars. I’m ok with that. Im sure the ones that came stock are chinese.
If your running cold water,you won’t have as many problems as running hot water 100 % .Heck $5 for a hundred is worth a try. I get my vitons for $12 at a 25 pck
But if they start blowing apart and plugging your system up from the DS to your wand zozzle or SC,you know everyone is gonna say. I TOLD YOU SO. 
Yeah, but I aint gonna tell you guys! I can get brown for $9+ for 100. Excellent rating too.
What usually kills them, the wear and tear? Or chems? Ill soak a few in straight bleach for a week and test them.
Heat ,acid for me. Sh for you house washers I’m assuming
