Boss/Soil rubber grommets kit?

[Sunjat]

Hello all forum members,

I've taken bathroom panel this morning and discovered water stain/patch under short boss connector and the bath waste.
I've taken it out in order to try and sit it properly and discovered that inbuilt rubber ring has hardened, so it's leaking water.
It's one of those inbuild rubber adopters, as per picture attached.
I went and bought another short boss to discover that the rubber rings differ in thickness between my old and new one.
I taker it each manufacture make their own seal rings?
Are there any spare rings or kits on the market for replacements, as by having Googles I was unbaled to find one.
How do plumbers normally tackles these failed seals?

Thank you for any advise on this.
Sunjat

 

[Sunjat]

Anyone?

 

[blup]

Match the replacement to the make of the soil pipe which should be stamped on the plastic body. If nothing, search screwfix, mcalpine are generally a good make but sizes/spec can differ.

Blup

 

[Sunjat]

Thank you Blup, will give that a go.