To follow up the magic words are "DN 2,7" and they are rare as rocking horse poo here.
I might have to get a box of 5 for 3€ apiece, not a stock item has never been.
Most of the hydraulic/pneumatic shops gave only "huh?" when asked, lost half a day
for phoning around.
thank you for the link!
I did look around the German sites and also ebay.de, but shipping cost was too high to even consider.
Just a moment ago made fake purchase on fittingstore.de and it seems I could get two plugs for a total
of Gesamtsumme: 1,76 € .
I am afraid that this is mistake on their web frontend as no shipping cost was quoted. Which may be true
for German address but seems doubtful for Estonia. We'll see, I chose prepayment and if they will send
payment reminder then it may be actually true and a good source.
Thank you for offer Jan, I will try first to order from their shop directly.
It would be great if you could wait till tomorrow before placing you order