Flex-hose 3x7nnd Neoprene Double Sphere Connector Flange

Product Description

The FLEX-HOSE 3x7nnd is a neoprene double sphere flexible pipe connector designed to absorb vibration, reduce noise, and compensate for minor misalignment in piping systems. Built with a flanged end connection, it measures 3 inches in bore diameter and 7 inches in face-to-face length. Rated at 150 psi, this connector suits pressurized fluid and HVAC hydronic applications where flexible movement and joint isolation are required. Plumbers, pipefitters, and mechanical contractors install this type of fitting as part of pump connections, chiller hookups, and other piping assemblies where rigid joints would transmit damaging vibration or thermal movement.

This connector is appropriate for commercial and residential mechanical systems including hydronic heating and cooling loops, chilled water systems, condenser water lines, and domestic water distribution where a flanged flexible joint is specified. The double sphere neoprene body provides greater angular deflection and vibration absorption compared to single sphere designs, making it a common choice at pump suction and discharge connections. Installations following ASHRAE, ASME, or local mechanical codes will typically require a flexible connector at rotating equipment interfaces.

Key Features

• Double sphere neoprene body for enhanced vibration isolation and angular deflection
• 150 psi pressure rating suitable for standard commercial hydronic and water systems
• 3-inch bore with flanged end connections for direct bolt-up to mating flanges
• 7-inch face-to-face length accommodates standard pump connection spacing
• Neoprene construction provides resistance to water, oils, and moderate temperature ranges common in HVAC piping

Compatibility

Designed as an OEM-style replacement or new-installation flexible connector for 3-inch flanged piping systems in commercial and residential mechanical applications.

Installation Notes

Installation should be performed by a licensed plumber or pipefitter in accordance with applicable mechanical and plumbing codes. Isolate and depressurize the piping system fully before removing any existing connector or breaking a flanged joint. Do not overtighten flange bolts in an uneven pattern — follow a cross-pattern bolt sequence to seat the flange faces evenly against the connector. Flexible connectors should not be used as the sole means of correcting gross pipe misalignment beyond the connector's rated deflection range.

Technical Specifications

• Bore Diameter: 3 inches
• Face-to-Face Length: 7 inches
• Pressure Rating: 150 psi
• Body Material: Neoprene
• Sphere Configuration: Double Sphere
• End Connection Type: Flange

Standard Information

• Brand: FLEX-HOSE
• Manufacturer Part Number: 3x7nnd