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I will second this. Everything else will leak over time and the shafts will strip out. QTP refused to warranty my cutouts because they were "too close to the collector" even though their warranty said nothing about mounting location. While the Doug's are expensive, they are worth every penny.



Yup..
There are multiple quality issues with QTPs...
Their motors are less robust and can fail, and the butterfly flap plate is too thin.. The biggest issue with QTPs is that when a problem arises they just blow it off.. They quote a 4 year warranty but to me its worthless if they don't back it up with a replacement product.

We have installed both and actually have had some Dougs which are now over 5 years old. The only issue we have had with the Dougs is their Chinese made toggle switch can burn out, so now we change over to an industrial grade USA made DPDT toggle switch no more issues.

We agree the Dougs may cost more but as Pappy always said the lowest price is not always the best deal..

Just my $0.03...