Trying to find a source for Walbro carb parts that are not included in the kits and it looks like you can't buy direct from Walbro, but have to go through one of their retail customer outlets, none of which are in Canada. Last time I bought a check valve it was listed at $2.40 US direct from Walbro and by the time I got it from my local Stihl dealer it was $8.90 CAD before tax.