Dwyer SFI-100-3/8 Sight Flow Indicator 3/8 Inch Npt

Product Description

The DWYER SFI-100-3/8 is a bronze-body sight flow indicator designed for visual confirmation of fluid or gas movement in pressurized piping systems. It accepts a 3/8 inch NPT threaded connection and is rated to 125 psi working pressure with a maximum service temperature of 200 degrees F. The body is cast bronze with a removable glass window and a Buna-N seal, giving technicians a direct line of sight into the flow stream without interrupting the line. At 3 inches overall length and 1.1 pounds, it installs easily into tight plumbing runs. HVAC technicians, plumbers, and fluid-system mechanics use this indicator to verify active flow at a glance during commissioning and routine service checks.

The SFI-100-3/8 is suited for a range of industrial and mechanical system applications including coolant tanks, hydraulic lines, hydraulic tanks, oil reservoirs, and pressure vessels. It supports both liquid and gas service. The horizontal and vertical mounting orientation options make it adaptable to most piping configurations encountered in commercial and light industrial installations. The compact 3-inch body fits standard service access panels and tight mechanical room plumbing without requiring additional fittings or reducers.

Key Features

• Bronze body construction with removable glass window for field inspection or replacement
• Rated to 125 psi maximum working pressure
• Maximum service temperature of 200 degrees F
• 3/8 inch NPT threaded connection, compatible with standard pipe fittings
• Buna-N seal material suitable for oil, coolant, and gas service
• Mounts in horizontal or vertical orientation
• Safety tested construction with 3 inches overall length

Compatibility

Designed as an OEM-style replacement or new-installation sight flow indicator for 3/8 inch NPT piping in coolant, hydraulic, oil, and gas pressure systems up to 125 psi and 200 degrees F.

Installation Notes

Installation should be performed by a licensed plumber or qualified mechanical technician. De-pressurize and drain the system completely before removing any existing fitting or installing this indicator. Use thread sealant or PTFE tape rated for the service fluid on the NPT threads. Verify mounting orientation matches the arrow or flow-direction marking on the body before final tightening.