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Refunds We will notify you once we’ve received and inspected your return, and let you know if the refund was approved or not. If approved, you’ll be automatically refunded on your original payment method. Please remember it can take some time for your bank or credit card company to process and post the refund too.

Zurn Wilkins 4-350AOSY 4" Double Check Valve Assembly (DCVA) Backflow Preventer with OS&Y (Open Stem & Yoke) Flanged End Gate Valves, Lead-Free Engineering Specification: The Double Check Backflow Prevention Assembly shall be certified to NSF/ANSI 372, ASSE® Listed 1015, and supplied with full port open stem & yoke gate valves. The main body and access cover shall be epoxy coated ductile iron (ASTM A 536 Grade 4), the seat ring and check valve shall be NORYL™, the stem shall be stainless steel (ASTM A 276) and the seat disc elastomers shall be EPDM. The checks shall be compound type, and accessible for maintenance without removing the device from the line. The Double Check Backflow Prevention Assembly shall be a ZURN WILKINS Model 350AOSY.

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Exchanges The fastest way to ensure you get what you want is to return the item you have, and once the return is accepted, make a separate purchase for the new item.

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Damages and issues Please inspect your order upon reception and contact us immediately if the item is defective, damaged or if you receive the wrong item, so that we can evaluate the issue and make it right.

Zurn Wilkins 4-350AOSY 4" Double Check Valve Assembly (DCVA) OS&Y Lead-Free Installation and Maintenance Instructions: Click Here.

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Exceptions / non-returnable items Certain types of items cannot be returned, like perishable goods, and custom products (such as special orders or personalized items). We also do not accept returns for hazardous materials, flammable liquids, or gases. Please get in touch if you have questions or concerns about your specific item. Unfortunately, we cannot accept returns on sale items or gift cards.

We have a 30-day return policy, which means you have 30 days after receiving your item to request a return. To be eligible for a return, your item must be in the same condition that you received it, unworn or unused, with tags, and in its original packaging. You’ll also need the receipt or proof of purchase. To start a return, you can contact us at info@masterbuildermercantile.com. If your return is accepted, we’ll send you a return shipping label, as well as instructions on how and where to send your package. Items sent back to us without first requesting a return will not be accepted. You can always contact us for any return question at: info@masterbuildermercantile.com.

Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.

Zurn Wilkins 4-350AOSY 4" Double Check Valve Assembly (DCVA) OS&Y Lead-Free BIM / 3D Models and 2D DXF Drawings: Click Here.

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Local codes shall govern installation requirements. Unless otherwise specified, the assembly shall be mounted at a minimum of 12" (305mm) and a maximum of 30" (762mm) above adequate drains with sufficient side clearance for testing and maintenance. The installation shall be made so that no part of the unit can be submerged.

Designed for installation on potable water lines to protect against both backsiphonage and backpressure of polluted water into the potable water supply. The Model 350A shall provide protection where a potential health hazard does not exist. Ideal for use where Lead-Free* valves are required.

Series LF25AUB-Z3 water pressure reducing valves are designed to reduce incoming water pressure to a sensible level to protect plumbing system components and reduce water consumption. This series is suitable for water supply pressures up to 300 psi (20.7Replaceable seat moduleIntegral stainless steel strainerBypass feature controls thermal expansion pressureHigh temperature resistant reinforced diaphragm for hot waterStainless steel strainer, EPDM diaphragm/valve disc