Nti 65116846 O-ring TRX150 TRX199 TRX199C

Product Description

The NTI 65116846 is a replacement O-ring sized 18 x 2.8 inches, designed to maintain a pressure-tight seal in NTI condensing boiler systems. O-rings of this type serve as critical sealing components between mating surfaces such as heat exchanger connections, pump flanges, or service ports. A failed or deteriorated O-ring in a hydronic heating system can result in water leaks that compromise system pressure and efficiency. Licensed heating technicians and plumbers install this part as part of routine maintenance or when servicing components that require disassembly and reassembly.

This O-ring is specified for use in NTI TRX-series condensing combination boilers, including residential and light-commercial installations. It applies directly to systems where the original sealing component has hardened, cracked, or deformed due to thermal cycling. Having the correct OEM-specified replacement on hand reduces downtime during service calls on these units.

Key Features

• OEM-specified replacement O-ring for NTI TRX-series boilers
• Sized at 18 x 2.8 inches to match original sealing geometry
• Maintains pressure integrity at system connections and service access points
• Direct fitment for TRX150, TRX199, and TRX199C models

Compatibility

Designed as a direct OEM replacement for the following NTI models: TRX150, TRX199, and TRX199C.

Installation Notes

Installation is typically performed by a licensed plumber or hydronic heating technician. Before replacing the O-ring, depressurize and drain the affected system loop and ensure all electrical power to the boiler is off. Inspect mating surfaces for scoring or debris before seating the new O-ring. Do not use petroleum-based lubricants on EPDM or rubber sealing components unless confirmed compatible with the O-ring material.

Technical Specifications

• O-Ring Size: 18 x 2.8 inches
• Compatible Models: TRX150, TRX199, TRX199C

Standard Information

• Brand: NTI
• Manufacturer Part Number: 65116846