Silicone o-rings for cornies

[Rad]

I'm looking for silicone o-rings to refurbish my kegs. I did the googling (no one uses bing ) and looked through the forum. Most sizes were easy to identify. This is what I've found:

• Dip Tube: BS 109 (ID: 0.299", CS: 0.103")
• Post: BS 111 (ID 0.424", CS 0.103")
• Ball lock disconnect: BS 013 (ID 0.426", CS: 0.07")

These fit the BS sizing and my measurements, thus are easy to find in shops.

The issue comes with the lid seal. BS 341 matches the ID but its cross section is 0.21" while it should be 0.275". As far as I've seen there is no BS size for an o-ring that's 3.475" ID and 0.275" CS. [EDIT: fixed ID]

Did anyone use BS 341 sized seal? Did it work?
Where (in UK) would I find the right sized silicone o-rings for the lid?

Please call me out if I got any of the sizes above wrong.

[Fil]

here is a link to an australian brewers forum where they have done the same fact finding with links to an ebay seller..

http://www.aussiehomebrewer.com/forum/i ... opic=67746

most the links worked last time i checked..

[Rad]

Thanks Fil. I know that lid's o-ring number is 417, but it's not a standard size. I'm looking for a supplier in UK if possible. I found polymax which sell all the standard sizes cheapish. They don't stock 417 and the nearest one is BS341 which is thinner. I'm wondering if anyone used the thinner standard seal and if it sealed ok?

[Rad]

I found out that the lid seal is also Caterpillar part no 9N-2693. It didn't help me find one yet

[Fil]

candirect, the german homebrew supplier sell the orange silicone lid ring at a good price, the
PnP however isnt so good but if you buy other kit at the same time the euro-xchange rate /price difference and resulting savings can offset the pnp costs..
I sourced my lid rings from them and post rings via the aussie forum links, for popets, i invested in some universal replacements via a 'for sale post' in here (worked great in the kegs ive tried so far)..

for the usual black ?nitrite? rings the best deals i found were via ebay and US sellers, circa £4 a corny set, however watch the number you order at 1 time, when ordering more than £15s worth of goods(pnp inc) from the US you are open to VAT on arrival, and US merchants fill in customs forms diligently unlike the Chinese..

[Rad]

The orange seals from candirect are EPDM according to the description and indeed expensive. Speaking of expensive, I emailed polymax asking if they stock BS417. I was impressed with a quick reply, with the price less so. £24 + £4.50 p&p for 10 seals is a bit much. I guess that's what you'd pay for a special order. BS341 are only £3.50 for 5 (minimal order) and I found a post where someone said they've used them fine. I think I can risk £3.50 and get some BS341s. If that fails I'll go back to black seals for the lids.

[Fil]

Ptfe tape could be used to painstakingly wrap around a slightly thinner oring to bulk it out a bit.
being thin tape it will deform with the ring under compression.
and being ptfe will stand up to a boil to sanitse..

Silicone or not the candirect rings are softer and do seal an older keg much easier.. must admit i didnt check out the materials and went by colour alone as folk speak of the 'soft orange silicone' lid rings. Consider me told..

[Jim my]

£3.75 a five ring set at The Malt Miller

http://www.themaltmiller.co.uk/index.ph ... ductId=655

[Brewedout]

Thanks Fil. I know that lid's o-ring number is 417, but it's not a standard size. I'm looking for a supplier in UK if possible. I found polymax which sell all the standard sizes cheapish. They don't stock 417 and the nearest one is BS341 which is thinner. I'm wondering if anyone used the thinner standard seal and if it sealed ok?

I have used polymax for the large o ring. It seals but only if you pull up and pressurise. If pressure is ever lost it would drop (unless you bend the feet of the lid hook). I'm still on the lookout for silicon orings that are chunky for the lid.

[Kev888]

FWIW I can confirm BS417 O'rings worked for me too. I got some orange silicone ones some years ago from an american seller on UK ebay, oringsandmore Unfortunately they have none listed in that size at the moment, but could be worth trying a message if you're stuck. In 2012 they cost me $7.50 per pair (they were being sold in packs of 2) including postage, and because I bought 15 packs I also got stung for some import charges.

I'm not sure it was worth the price and effort of importing them TBH, they may have been slightly softer than the standard O-rings but the difference wasn't as profound as I'd expected. Some people seem to like them though... whether there are different hardnesses of silicone orings available I don't know. I had a quick look and found these on ebay which seem to be white, so maybe all are not identical.

Cheers
Kev

[Rad]

The letter from polymax arrived today. The BS341 are certainly the right diameter and seem to fit well. Can't say if they'll seal yet. I'll give the corny a good clean on the weekend and fit the new o-rings. I'll report back when done.

[Brewedout]

The letter from polymax arrived today. The BS341 are certainly the right diameter and seem to fit well. Can't say if they'll seal yet. I'll give the corny a good clean on the weekend and fit the new o-rings. I'll report back when done.

They will seal, but only when you pressurise. Before the co2 it will be loose.

[DaveGillespie]

I got mine from Oringsandmore but they didn't have the lid orings listed on ebay - they're available on their website though, postage to the UK is very reasonable.

I'm very happy with mine - one of the cornies with these seals will seal and hold pressure at 5psi when I was using it with a Beer Engine.

[Rad]

I finally got around to fitting the o-rings and I must say I'm happy. Both kegs I've done yesterday seal fine without any extra pressure. Even the smallest dab of gas stays in. That said, I'll probably order the BS417s next time.