Taco 418-4 Air Vent 3/4" MPT X 1/2 FPT
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Taco 418

Taco 185-086C Cast Iron Companion Flange Set, 2", NPT

Taco 1600-868CRP

Taco heat motor zone valves provide a time proven method for system zoning and control. The exclusive heat motor design operates silently, while the twist off head allows for serviceability without disturbing system connections.

• Heat motor zone valves provide a convenient way to create individual zones or equipment isolation in a hydronic heating system
• Using multiple heat motor zone valves and a single pump, you can start, stop or divert flow through the system to provide individual room or area comfort control and energy savings
• Rugged dependability
• Silent operation
• Twist off head
• Bellows valve construction ensures positive shut-off and leak proof operation
• Patented construction
• Easy-to-install
• Manual open lever
• 100% factory tested
• 24 VAC powered with isolated end switch
• Made in USA
• 3 year head, 5 year body warranty

Sid Harvey Item #:B163-78: Replaces Part #:'s : 21470,
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Taco B163-77

Taco SR503-4 switching relay is the best choice for all your zoning needs, with advanced powerport cards, External diagnostic lights, switchable priority and contractor friendly PC board layouts. Combined with the time proven reliability of the 00 family of circulators and thermostats, total system integrating is achieved. External indicator lights provide instant diagnostic feedback, making a snap of service calls or new installation start-ups.

• External indicator lights
• Switchable priority
• Priority protection
• Simplified wiring
• Sealed relays
• Fuse protected outputs
• Compact design
• 100% factory tested
• Isolated end switch
• Contractor friendly PC board layout
• Universal thermostat compatibility
• All circulator relay connections, including ZC/ZR, are rated 1/3 HP (6 amp full load, 36 amp locked rotor) at 120 VAC
• End switch connections are rated 24 VAC, 1 amp
• All thermostat connections supply a 24 VAC class 2 output

Sid Harvey Item #:SR503: Replaces Part #:'s : ERSR301,
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Taco SR501

Taco Z075P2-2 Zone Valve 3/4" Press Sentry,
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Taco Z075F2-1

Taco 0015-MSF3-IFC Circulator Pump Cartridge 1/20 HP 120 VAC Flanged 18 GPM Max

ZSI Foster UX13810