The electric has a filter attached. Not sure about what you mean by putting them in parallel. Using the highly scientific "blow" test, there's little to no restriction in the one way valve I used.
Last edited by Tiny; 07/25/20197:02 PM.
Save a life, adopt a senior shelter pet. The three main causes of blindness: Cataracts, Politics, Religion. Name your dog Naked so you can walk Naked in the park.
there's little to no restriction in the one way valve I used.