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4X31/2 BLK MI REDUCER
Manufacturer Resources
Product Specs
- Dimensions Specification:
- ASME B16.3
- End Conn Size 1:
- FPT
- End Conn Size 2:
- FPT
- Material Specification:
- ASTM A-197
- Pressure Rating Specification:
- ASME B16.3
- Size 1:
- 4
- Size 2:
- 3.5
- Strength:
- STD
- Thread Specification:
- ASME B1.20.1
- Ul Fm:
- Yes
- Department:
- Plumbing
- Product Group:
- Plumbing Fittings
- Product Subgroup:
- Reducers
- Product Type:
- Reducer
- Product Finish:
- Black
- Product Material:
- Malleable Iron
- Product Weight:
- 6.3 lbs
ASC Engineered Solutions 310092408 – Frequently Asked Questions
1) What size pipe does the ASC 4 x 3-1/2 black malleable iron reducer connect?
It joins 4 inch pipe down to 3-1/2 inch pipe, with female pipe threads (FPT) on both ends. Both ends are tapered NPT threads made to ASME B1.20.1, so it threads directly onto standard male-threaded black steel or malleable iron pipe nipples of those two sizes.
2) Is this 4 x 3-1/2 malleable iron reducer approved for fire sprinkler piping?
It carries UL/FM approval, which is what an AHJ looks for on wet and dry sprinkler system fittings. It is a standard (STD) pattern black malleable iron fitting built to ASME B16.3 for dimensions and pressure rating.
3) Can I use a black malleable iron reducer on a potable water line?
No. Black malleable iron is for non-potable service, typically fire protection, natural gas, compressed air, and steam. The black finish is an uncoated mill finish with no corrosion barrier, so it rusts in wet potable service. Use galvanized malleable iron, brass, or copper on potable water instead.
4) Do I need a bushing instead of this reducing coupling for a 4 to 3-1/2 inch transition?
A reducing coupling like this one has female threads on both ends, so it takes a male nipple on each side and keeps the reduction inside the fitting body. A reducing bushing is male on the large end and female on the small end and screws into an existing female port. If you are coupling two lengths of threaded pipe, the reducer is the part you want; if you are stepping down inside a tee or valve outlet, use a bushing.
5) What does STD strength mean on a 4 inch malleable iron fitting?
STD is the standard weight class, rated per ASME B16.3, as opposed to the heavier 300 class pattern. For most black iron gas, air, and sprinkler work at ordinary working pressures, standard weight is the normal specification; high pressure systems call out the 300 class fitting instead.
6) What material spec does this ASC black iron reducer meet, and will it pass an inspection callout?
The casting is made to ASTM A-197 malleable iron, with dimensions to ASME B16.3 and NPT threads to ASME B1.20.1. Those are the three specs typically written on a mechanical drawing for threaded black iron fittings, so it matches a standard spec callout.
7) Does this reducer need thread sealant or can I run it dry?
Both ends are tapered NPT female threads, and tapered pipe threads seal on the flanks rather than at a gasket, so they need pipe dope or PTFE tape rated for the service. On gas lines use a sealant approved for fuel gas; on fire protection lines use one accepted for sprinkler work.
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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 ASC Engineered Solutions 310092408 come with a warranty?
Absolutely. The ASC Engineered Solutions 310092408 is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
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