Robertshaw 700-503 Millivolt Gas Valve 1/2" x 3/4" Non-Regulated Side Tap

The Robertshaw 700-503 is a millivolt gas valve designed for use in gas-fired heating appliances that operate on standing pilot systems. This non-regulated valve features a 1/2-inch inlet connection and 3/4-inch outlet connection with a convenient side tap configuration for pressure testing and gauge installation.

Key Features:

• Millivolt operation requiring 250 to 750 millivolts from thermopile or powerpile generator
• Non-regulated design for applications with external pressure regulation
• 1/2" NPT inlet x 3/4" NPT outlet connection sizes
• Side tap port for pressure measurement and system diagnostics
• Standing pilot ignition system compatibility
• Durable brass construction for long service life
• Manual on/off control with thermostat terminals

This valve is commonly used in residential and commercial gas heating equipment including furnaces, unit heaters, and duct furnaces. The millivolt control system eliminates the need for external electrical power, making it ideal for remote installations or backup heating applications.