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The bulkhead fitting features a solder cup and male NPT thread. Please refer to NIBCO technical data sheets and catalogs for engineering and installation information. In addition to its inherent qualities of beauty, durability and low maintenance, copper's reusability makes it an ideal application in sustainable projects. NIBCO® copper fittings are manufactured in an ISO 9001 certified facility, and backed by a 50-year limited warranty. Because of its longstanding reputation for innovation and precision in design and manufacturing, NIBCO is the preferred brand in the industry.
Copper Fittings Installation Instructions
- Dezincification resistant
- Use in U.S. drinking water applications is prohibited after January 3, 2014
- ASTM B584 Alloy C84400
- Material and workmanship per ASME B16.18
Copper Fittings Installation Instructions
Manufacturer Resources
Product Specs
- All Basic Material:
- Bronze
- Classification:
- Solder Pressure Bulkhead Fittings
- End Connection:
- Threaded
- Metal End Connection Type:
- C x M (NPT)
- Product Group:
- Fitting
- Product Type:
- Solder Pressure Bulkhead Fittings
- System Use:
- Commercial Plumbing, Fire Protection, Heating, HVAC, Industrial, Irrigation, Residential Plumbing
- Product Subgroup:
- Bulkhead Fitting
- Department:
- Plumbing
Nibco B352300 – Frequently Asked Questions
1) What kind of connections does the Nibco 750-4 bulkhead fitting have on each end?
One end is a solder cup that takes copper tube, the other is a male NPT thread. Nibco lists the configuration as C x M (NPT). So you sweat the copper side and thread the other side into a female NPT port or secure it through a tank wall with a nut on the thread.
2) Can I use the Nibco 750-4 bulkhead fitting on a potable drinking water line?
No. Nibco states use in U.S. drinking water applications is prohibited after January 3, 2014. It is a cast bronze body in ASTM B584 Alloy C84400, which is not a lead-free potable alloy. For potable water, specify a lead-free fitting instead. The 750-4 is for non-potable service.
3) What pipe sizes does the Nibco 750-4 bulkhead fitting come in?
Two sizes: 1/2 inch (MPN B352300) and 3/4 inch (MPN B352350). Size refers to nominal copper tube on the solder side with the matching male NPT thread on the other.
4) What systems is the Nibco 750-4 bulkhead fitting approved for?
Nibco lists it for commercial plumbing, fire protection, heating, HVAC, industrial, irrigation and residential plumbing. Keep in mind the drinking water restriction, so in practice that means hydronic heating and chilled water loops, fire lines, irrigation and industrial process piping rather than potable supply.
5) What is the Nibco 750-4 bulkhead fitting made of, and will it hold up in water with aggressive chemistry?
Cast bronze, ASTM B584 Alloy C84400, and Nibco calls it dezincification resistant. That matters on the tank and boiler work these get used for, where a high-zinc brass can lose zinc over time and fail. Material and workmanship are per ASME B16.18.
6) Is a bulkhead fitting the right choice, or should I just use a male adapter?
Use the 750-4 bulkhead style when the pipe has to pass through a wall of a tank, vessel or panel and seal at that wall. A plain solder-to-male-NPT adapter only joins pipe to a threaded port; it does not make a pass-through connection. If you are simply transitioning copper tube to a female NPT fitting, an adapter is the cheaper part. If the joint is through sheet or tank wall, the bulkhead is what you want.
7) How do I solder the copper end of a Nibco bulkhead fitting without damaging the seal?
Sweat the copper side before you set the fitting into the tank or panel wall, or at minimum before any gasket or washer is on the thread, since torch heat will cook an elastomer seal. Nibco publishes Copper Fittings Installation Instructions covering joint prep and soldering for these fittings, and their technical data sheets carry the engineering detail for the 750-4.
8) What is the Nibco part number for a 3/4 inch bulkhead fitting?
B352350 is the 3/4 inch 750-4, and B352300 is the 1/2 inch. Order by that MPN if you are matching an existing spec or reordering for a fleet of units.
How fast can I get the Nibco B352300 delivered?
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reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Nibco B352300 come with a warranty?
Absolutely. The Nibco B352300 is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
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