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OMI Parts
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OMI Parts manufactures replacement parts and accessories for heating systems and oil-fired HVAC equipment. Its specialties include aquastat wells, pigtail siphons, pump couplers, vent caps, and oil tank accessories. Founded in 1982, OMI Parts is a family-run manufacturing business with offices in New York and India. It began by producing heating industry replacement parts for OEM customers and wholesale distributors. HVAC service technicians, oil burner service companies, and heating wholesalers specify OMI Parts products for oil-fired heating system service work. These jobs require specific replacement components, such as boiler aquastat wells, oil pump pigtails, and oil system accessories.
Product Lines
Aquastat Wells
OMI Parts manufactures aquastat wells in 1/2-inch and 3/4-inch sizes for residential and light commercial boilers. Aquastat wells are threaded fittings that mount in a boiler's aquastat port and provide a sensing pocket for the aquastat's temperature-sensing bulb. OMI Parts aquastat wells provide direct-fit replacements for common residential boiler configurations.
Pigtail Siphons
OMI Parts produces pigtail siphons in angle brass configurations for boiler pressure gauge and pressuretrol connections. A pigtail siphon traps water condensate in a coiled loop to protect the gauge or control from steam pressure and temperature. These siphons are specified during boiler pressure gauge or pressuretrol replacement. They are also specified during boiler service when the existing pigtail shows corrosion or damage.
Steam Siphon Pigtails
OMI Parts' steam siphon pigtail line covers the specific pigtail configurations for steam heating boiler pressure instrument connections. Steam boiler applications subject the pigtail to higher temperatures and more demanding cycling conditions than hot water systems. OMI Parts steam siphon pigtails are sized and constructed for steam service.
Pump Couplers
OMI Parts manufactures pump couplers — also known as coupler assemblies — for oil burner pump connections, including the OM876 Coupler Assembly for compatible residential oil burner configurations. A pump coupler connects the oil burner motor shaft to the oil pump shaft. When it wears or fails, the oil burner loses fuel supply and requires a replacement coupler.
Oil Tank Accessories
OMI Parts' oil tank accessory line covers vent caps with screens for residential oil storage tanks. These caps allow the tank to breathe during fuel delivery and consumption. They also prevent rain, insects, and debris from entering the vent line.
Why Contractors Specify OMI Parts
OMI Parts has been manufacturing replacement parts for the heating industry since 1982. The aquastat well and pigtail siphon line covers the specific sizes and configurations service technicians encounter. These come up on residential and light commercial oil-fired boiler or steam boiler service calls. The OM876 Coupler Assembly addresses one of the common mechanical failure modes in residential oil burner systems — coupler wear. OMI Parts' long-running relationship with the wholesale heating distribution channel makes it a reliable source for small-format specialty parts that aren't always well-stocked through general HVAC supply.
Frequently Asked Questions
Where are OMI Parts products manufactured?
OMI Parts products are manufactured by a family-run operation with offices in New York and India. The company has been manufacturing replacement parts for the heating industry since 1982.
Do steam boilers need a different pigtail siphon than hot water boilers?
Yes. Steam boiler applications subject the pigtail to higher temperatures and more demanding cycling conditions than hot water systems. Steam-rated pigtails are required for steam boiler applications, and OMI Parts steam siphon pigtails are sized and constructed for steam service.
What's the difference between OMI Parts aquastat wells in 1/2-inch and 3/4-inch sizes?
The difference is the thread size of the boiler port where the well mounts — 1/2-inch NPT or 3/4-inch NPT. The correct size is determined by the thread size of the aquastat port on the specific boiler being serviced.
What is a pigtail siphon used for in a boiler installation?
A pigtail siphon is a coiled tube that mounts between a boiler's pressure port and a pressure gauge or pressuretrol. It traps water condensate in the loop to protect the gauge or control from steam pressure and temperature. OMI Parts pigtail siphons are specified during pressure gauge or pressuretrol replacement and when the existing pigtail shows corrosion or damage.
What oil burner applications is the OMI Parts OM876 Coupler Assembly designed for?
The OM876 Coupler Assembly is a specific pump coupler in the OMI Parts catalog designed for compatible residential oil burner motor and pump configurations. It connects the oil burner motor shaft to the oil pump shaft. Matching the coupler to the specific oil burner make and model is the starting point for choosing a replacement.
What OMI Parts product is right for an oil tank vent line replacement?
For oil tank vent line replacement needing a new termination fitting, the OMI Parts vent cap with screen is the appropriate product. It allows the tank to breathe while preventing rain, insects, and debris from entering the vent line.
