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M400

Stainless Steel Reduced Pressure Zone Assembly Backflow Preventers

Features

  • Protects against backsiphonage, backpressure, and the fouling of either check valve
  • Extremely compact design is significantly lighter than traditional designs
  • Patented link check provides low pressure loss
  • Entire valve body and closure sleeve manufactured from 304 stainless steel
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Series M400, M400N, M400Z reduced pressure zone assembly backflow preventers are designed to prevent the reverse flow of polluted water from entering into the potable water supply due to backsiphonage and or backpressure. It consists of stainless steel body, sleeve and torsion spring check valves. Series M400, M400N, M400Z features the certified lowest pressure loss, a compact design that is 70% lighter than traditional designs and is ideal for health hazard piping applications for protection against backsiphonage or backpressure. Check with local water authorities for installation requirements. Maximum working pressure is 175 psi (12.06 bar).

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Select options below to identify the UPC, Order Code, and Repair Kit for a specific M400

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Model Product Used On - Series or Model Kit Contents
Product Image - RK-C400/C500/M400/M500
ARK C/M 400/500RV

Relief Valve Rubber Parts Kit

</br></br>

RV Diaphragm, RV Piston, RV E-Clip, RV O-ring, Lube</br>
Product Image - ARK C-M 400-500VT 2 1-2-10
ARK C/M 400/500VT

Total Relief Valve Kit

</br></br>

Complete RV with 36 IN Hose, RV O-ring, Lube</br>
Product Image - First Check Kit For 2 1/2 To 3 In Reduced Pressure Zone Assembly M400, Rpz Detector Assembly M500, Red Silicone Check Disk
ARK M400/M500 CK1 2 1/2-3

First Check Kit

</br></br>

First Check Assembly, Check O-ring, Lube</br>
Product Image - First Check Kit For 2 1/2 To 3 In Reduced Pressure Zone Assembly M400, Rpz Detector Assembly M500, Epdm Check Disk
ARK M400/M500 CK1E 2 1/2-3

First Check Kit

</br></br>

First Check Assembly, Check O-ring, Lube</br>
Product Image - ARK M400-M500 CK2 2 1-2-3
ARK M400/M500 CK2 2 1/2-3

Second Check Kit

</br></br>

Second Check Assembly, Check O-ring, Lube</br>
Product Image - ARK M400-M500 CK2E 2 1-2-3
ARK M400/M500 CK2E 2 1/2-3

Second Check Kit

</br></br>

Second Check Assembly, Check O-ring, Lube</br>
Product Image - ARK M400-M500 RC4 2 1-2-3
ARK M400/M500 RC4 2 1/2-3

Check Rubber Parts Kit

</br></br>

Shutoff Disc, Check O-ring, E-Clip, Lube</br>
Product Image - ARK M400-M500 RC4E 2 1-2-3
ARK M400/M500 RC4E 2 1/2-3

Check Rubber Parts Kit

</br></br>

Shutoff Disc, Check O-ring, E-Clip, Lube</br>
Product Image - ARK M400-M500 RT 2 1-2-3
ARK M400/M500 RT 2 1/2-3

Complete Rubber Parts Kit

</br></br>

Shutoff Disc, Check O-ring, Sleeve O-ring, E-Clip, RV Diaphragm, RV Piston, RV E-Clip, RV O-ring, Lube</br>
Product Image - ARK M400-M500 RT-E 2 1-2-3
ARK M400/M500 RT-E 2 1/2-3

Complete Rubber Parts Kit

</br></br>

Shutoff Disc, Check O-ring, Sleeve O-ring, E-Clip, RV Diaphragm, RV Piston, RV E-Clip, RV O-ring, Lube</br>
Product Image - ARK M400-M500 CK1 4
ARK M400/M500 CK1 4

First Check Kit

</br></br>

First Check Assembly, Check O-ring, Lube</br>
Product Image - ARK M400-M500 CK1E 4
ARK M400/M500 CK1E 4

First Check Kit

</br></br>

First Check Assembly, Check O-ring, Lube</br>
Product Image - ARK M400-M500 CK2 4
ARK M400/M500 CK2 4

Second Check Kit

</br></br>

Second Check Assembly, Check O-ring, Lube</br>
Product Image - ARK M400-M500 CK2E 4
ARK M400/M500 CK2E 4

Second Check Kit

</br></br>

Second Check Assembly, Check O-ring, Lube</br>
Product Image - ARK M400-M500 RC4 4
ARK M400/M500 RC4 4

Check Rubber Parts Kit

</br></br>

Shutoff Disc, Check O-ring, E-Clip, Lube</br>
Product Image - ARK M400-M500 RC4E 4
ARK M400/M500 RC4E 4

Check Rubber Parts Kit

</br></br>

Shutoff Disc, Check O-ring, E-Clip, Lube</br>
Product Image - ARK M400-M500 RT 4
ARK M400/M500 RT 4

Complete Rubber Parts Kit

</br></br>

Shutoff Disc, Check O-ring, Sleeve O-ring, E-Clip, RV Diaphragm, RV Piston, RV E-Clip, RV O-ring, Lube</br>
Product Image - ARK M400-M500 RT-E 4
ARK M400/M500 RT-E 4

Complete Rubber Parts Kit

</br></br>

Shutoff Disc, Check O-ring, Sleeve O-ring, E-Clip, RV Diaphragm, RV Piston, RV E-Clip, RV O-ring, Lube</br>
Product Image - ARK M400-M500 CK1 6
ARK M400/M500 CK1 6

First Check Kit

</br></br>

First Check Assembly, Check O-ring, Lube</br>
Product Image - ARK M400-M500 CK2 6
ARK M400/M500 CK2 6

Second Check Kit

</br></br>

Second Check Assembly, Check O-ring, Lube</br>
Product Image - ARK M400-M500 RC4 6
ARK M400/M500 RC4 6

Check Rubber Parts Kit

</br></br>

Shutoff Disc, Check O-ring, E-Clip, Lube</br>
Product Image - ARK M400-M500 RT 6
ARK M400/M500 RT 6

Complete Rubber Parts Kit

</br></br>

Shutoff Disc, Check O-ring, Sleeve O-ring, E-Clip, RV Diaphragm, RV Piston, RV E-Clip, RV O-ring, Lube</br>
Product Image - ARK M400-M500 CK 1 8-10
ARK M400/M500 CK1 8-10

First Check Kit

</br></br>

First Check Assembly, Check O-ring, Lube</br>
Product Image - ARK M400-M500 CK2 8-10
ARK M400/M500 CK2 8-10

Second Check Kit

</br></br>

Second Check Assembly, Check O-ring, Lube</br>
Product Image - ARK M400-M500 RC4 8-10
ARK M400/M500 RC4 8-10

Check Rubber Parts Kit

</br></br>

Shutoff Disc, Check O-ring, E-Clip, Lube</br>
Product Image - ARK M400-M500 RT 8-10
ARK M400/M500 RT 8-10

Complete Rubber Parts Kit

</br></br>

Shutoff Disc, Check O-ring, Sleeve O-ring, E-Clip, RV Diaphragm, RV Piston, RV E-Clip, RV O-ring, Lube</br>
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Approval/Certification Information

For product-specific approval information, please refer to the product’s specification sheet (see literature section above) or ask a Watts representative. Some certification agencies allow you to search by product name and brand.