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[APD] Aqua-Medic regulator 104?

Does anyone know if the Aqua-Medic Regulator 104 needs an extra washer ?  It 
appears to have an O-ring, but not a washer per se. Is a washer necessary or 
helpful?  Does one have the O-ring replaced as one would a washer? If so, where 
to find?
Thank you!  
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