Kanaifu Fire Fighting Ductile Iron Grooved 3 Inch Pipe Fitting 45 Degree Elbow with FM/UL Certificates for Industrial Use

We’re seeing a working presure of 2.5MPa right out of the gate, which is roughly 362 PSI for those doing the conversion—this holds up better than a lot of standard threaded fittings in dry or wet riser systems, and the FM/UL certifications aren’t just stickers, they mean the casting and grooving process was actually tested for burst and leak resistance under repeated load cycles.

Hot-dip galvanizing over ductile iron gives you more than just a shiny surfce. It’s about 2-3 mils of zinc that bonds metallurgically, so you don’t get the flaking you’d see with painted or electro-galvanized parts when pipe gets knocked around during installation. Most buyers go with the 3-inch for 6-inch mains and 4-inch drops, but we’ve had guys run these on 2-inch branches for gas systems too—though I’d check local code first because some jurisdictions require threaded for gas, not grooved.

The grooved connection uses a standard coupling—Victaulic style or equal—so you don’t need threading equipement on site, just a torque wrench and some lubricant (usually a PTFE-based paste). We typically stock these in DN80 (3-inch) as the 45-degree elbow, but the size range runs from DN25 to DN300 give or take, and the 2-inch and 4-inch versions share the same 2.5MPa rating. Small orders are accepted, so you’re not stuck buying a pallet if you only need 20 units or so for a retrofit job.

One thing that catches people off guard is the 2 years from shipment, but that’s only for manufacturing defects—don’t expect coverage if the groove gets deformed by an impact or you overtighten the coupling bolts. The HS code is 73071100, which is a clean classification for ductile iron fittings, so customs shouldn’t flag it for extra duties if you’re importing.