25AUB-Z3 / N35B Both units - are bronze, have removable strainer, seat, and have the bypass feature. The design difference allows the 25AUB-Z3 to have a higher flow rate than the N35B. Properly sized, either unit should work fine for your residence. Even though these units have a bypass you should still have an expansion tank on your hot water distribution system.

I think I understand, thanks! One last question. Do you think it's worth for me to be able to clean out the strainer? I'm on city water.

Can someone tell me the advantages between the 25AUB-Z3 and the N35B Watts pressure reducing valves? Which one should I get? The 25AUB-Z3 valve seems to be about 15 bucks more expensive. [www.wattsregulator.com]

These are the same type of device; different bells and whistles. The N35B has an bypass feature and 'cartridge' type seat assembly for easy repair. The other model has a strainer which can be easily accessed for periodic cleaning. Both are widely seen in residential use, as are the Wilkins model 70 and model 600.

Sorry, I guess I'm really confused. The discription for the N35B & 25AUB both say they are "Water Pressure Reducing Valves" and "consists of a bronze body construction". What is the difference between a water pressure regulator and a water pressure reducing valve??? I want to reduce the pressure comining into my house which is now at 100PSI.

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I get it, the size range for the 25AUB-Z3 is 1/2" to 2" and for the N35B it's 1/2" to 1". Thanks! Your answer makes alot of sense.

The 25AUB, is a bronze body water pressure regulator The N35B is a water pressure reducing valve both are set at the factory for 50 lbs. You really have to know your needs before making a choice. Best Wishes