These o-rings seal the BMW press & clip hose connections.  Excellent quality & made in the USA.

Also included are Part #s:
17227613656 (17227800958) x 4
11537584829
11537545278 (Thermostat hose flange at the cylinder head.  We recommend updating the flange with an        aluminum one if you're already in there.)

Kit services vehicles equipped with automatic transmissions.  For manual transmission and complete vehicle kits for other vehicles, please see links below.  

We're the 1st in the world to offer these kits for BMW cooling systems and with trial and testing on vehicles we ourselves service, our kits optimize performance, quality, and value through the use of multiple compounds (NBR, HNBR, EPDM).  All the green o-rings in our kits are peroxide cured EPDM, which we use in the most vulnerable locations for its excellent high & low temperature performance (-30C/-22F-150C/300F), resistance to compression set, and chemical resistance to glycol based coolants.  We have transitioned all of our kits to more of these EPDM o-rings for the most vulnerable and highly stressed connections.  Also included is a packet of water based lube, which can be used on all coolant connections. Many copycats out there now, but go with the original.   

When encountering o-rings of identical size, green ones may be used only for coolant connections.

Do not use petroleum based lubricants on any coolant connections!

If you are uncertain about which kit you need, please send us the last 7 digits of your VIN to verify compatibility.  


*Standard shipping is USPS 1st Class Package, 2-5 days in most cases.  If you need your item sooner choose expedited shipping, USPS Priority Mail 2-3 days or USPS Priority Express 1-2 days guaranteed.

We carry a large inventory.  For orders of more than 10 kits, please contact us!

For other complete vehicle kits, please click the proceeding links:





 X3 X5: e83, e53, e70

Z4 e85 e86

If you require coverage for a different model, please contact us and we'll assemble a kit that will cover your needs.

These are metric o-rings and are of the same dimensions as the ones that came on your car.  The cooling system on the 3 series (and all other BMWs) requires a good deal of maintenance, especially the expansion tank (ET) and thermostat.  In most cases, the o-rings at press & clip hosing ends will leak after they've been disconnected due to compression set.  During winter, leaks tend to develop during the cool down cycle as the already compressed rubber o-rings contract with lower ambient temperatures.  Where applicable, all kits include the temperature sensor o-ring for the lower radiator hose.

BMW does not offer o-rings for their press & clip hose connections and most dealerships do not stock the o-ring for the coolant temperature sensor in the lower radiator hose separately.   But don't waste money buying a new sensor or unnecessarily replacing hose assemblies, all of which can last well beyond 10 years/150,000 miles.  We've assembled this kit for working on customers' vehicles after growing tired of throwing away countless serviceable parts when all that was needed were some fresh o-rings.  

The photo in this listing is generic.  Our kits contain between 19 and 34 o-rings depending on application.