If you run a pump-parts wholesale business, you already know the truth: customers don’t walk in asking for “a mechanical seal.” They walk in with a greasy OEM tag, a pump nameplate photo, and a sentence like “I need the John Crane thingy for a 35 mm shaft—send it today.” Your job is to turn that chaos into an order.
The fastest way is a cross-reference brain: knowing that a John Crane Type 1, a Burgmann MG1, an AES W01, and a Roten Type 1 are basically cousins in the single-spring rubber-bellows family.
John Crane is the reference language of the sealing world. Even if you don’t stock JC, your customers speak it.
Type 1 / Type 2 – single-spring rubber bellows; water, HVAC, light chemical, irrigation. Crosses to Burgmann MG1, AES W01/W02, Roten Type 1.
Type 21 / 2100 – compact elastomer bellows for shallow stuffing boxes; wastewater and potable water.
Type 502 / W502 – unitized elastomer bellows for confined gland space, hot water, paints, weak acids, food-adjacent duties.
58U / 59U – multi-spring O-ring (58U) and PTFE-wedge (59U) pusher seals for chemical pumps. 59U is the corrosive-duty hero.
58B / 59B – balanced versions for higher pressure.
606 / 604 – welded metal bellows for hot oil, reactors, refinery agitators. Low volume, high ticket.
5610 / 5620 – single and double cartridge process seals.
Wholesale tip: Stock Type 1, Type 2, 58U, 59U, 2100 in 12–50 mm. Those five families answer 70% of John Crane requests from MRO and water customers.
Burgmann buyers are usually engineers. They care about DIN dimensions, face flatness, and material certs—not just “will it fit.”
MG1 / MG12 / MG13 – rubber bellows workhorses. MG1 = John Crane Type 1 territory.
M3N / M7N – wave-spring pusher seals for clean water, sewage, oil, moderate chemicals. M7N is one of Europe’s most quoted balanced pusher seals.
M74 / H74 – multi-spring process seals, John Crane 58/59-class equivalents.
H7N / H75N / HJ92N – stationary-design and wave-spring seals for tougher process duty.
MFL85N / Cartex-SN / Cartex-DN – metal-bellows and cartridge platforms for chemical and refinery plants.
Wholesale tip: If you sell into EU-project distributors, M7N and MG1 are non-negotiable stock items. Pair them with M3N for Italian/German end-suction pumps.
Flygt (Xylem) submersible pumps don’t live in a lab. They eat rags, sand, grease, and stormwater. The seal’s job is to keep raw sewage out of the oil chamber.
Flygt 2066 / 2102 – 2000-series submersible bellow shaft seals.
Flygt 3068 – probably the most asked-after Flygt seal in the aftermarket world.
3085 / 3102 / 3127 – 3000-series plug-in / Griploc-style bellow shaft seals.
Wholesale tip: Flygt business is repeat, municipal, contract-maintenance money. Municipalities don’t buy one seal—they buy 40 a quarter. Stock 3068, 3085, 3102 in common shaft sizes and you become “the Flygt guy” in your region.
Miaoyu’s Flygt bellow shaft seals use debris-shedding rubber bellows and bonded alumina/SiC seats, holding leak separation between sewage and oil chamber—exactly what repair contractors want.
Grundfos distributors win on shaft size accuracy, not brand romance. A CR 45-3 doesn’t care about marketing; it cares whether the cartridge is 25 mm, 30 mm, or 35 mm.
CR / CRN cartridge seals – multistage booster pumps. 12–32 mm shaft sizes move constantly.
TP / NK / NB – circulators and end-suction HVAC pumps.
CH / CHI / CHE – smaller circulator and inline pumps.
BT / GLF / CM – older circulator and lightweight domestic water platforms.
Wholesale tip: Grundfos is a metric cartridge game. Stock pre-assembled rubber cartridge seals for CR 15/20/32/45 and TP 40/50/65. EPDM for heating water, NBR for groundwater, FKM for mild chemicals.
Miaoyu’s Grundfos cartridges are torque-pin gland designs with carbon vs ceramic/SiC/TC faces, cutting install errors and fitting CR/CRN/TP/NB/NK directly.
Alfa Laval seals don’t sell like water-pump seals. They sell to dairies, breweries, beverage lines, pharma utilities, and CIP crews who will reject a seal for a burr or a trapped product zone.
LKH / SolidC / MR series – hygienic centrifugal pumps.
LKPL / SR / SRU / NMOG – lobe/rotor pumps with compact seal chambers.
Sanitary cartridge & double cartridge seals – CIP/SIP capable, polished finishes, FDA-grade elastomers.
Wholesale tip: Don’t compete on price here. Compete on hygienic geometry, FDA/EC1935 elastomers, CIP/SIP thermal-shock resistance, and documentation.
Miaoyu’s Alfa Laval-compatible seals use self-lubricating carbon graphite faces, SiC/TC seats, and open hygienic geometry for tool-free cleaning—built for LKH/SolidC/MR duty.
| Customer says | John Crane | Burgmann | Flygt | Grundfos | Alfa Laval |
|---|---|---|---|---|---|
| Rubber bellows water seal | Type 1 / Type 2 | MG1 | — | CH / CM | — |
| Compact shallow box | Type 21 / 2100 | MG12 / MG13 | — | — | LKH component |
| Chemical pump, PTFE | 59U | M74 PTFE | — | — | — |
| Balanced pusher | 58B | M7N / M3N | — | CR cartridge | — |
| Submersible sewage | — | — | 3068 / 3085 / 3102 | — | — |
| Multistage booster | — | — | — | CR / CRN cartridge | — |
| Hygienic food pump | Type 8-style sanitary | Cartex-SN hygienic | — | — | LKH / SRU cartridge |
| Hot oil / reactor | 606 | MFL85N / H7N | — | — | — |
One supplier, five brand languages – John Crane pushers, Burgmann wave-spring seals, Flygt bellow shaft seals, Grundfos cartridges, Alfa Laval hygienic seals.
Drop-in, not “approximately fits” – built to original gland dimensions, shaft size, setting length, and spring behavior.
Upgrade path = higher distributor margin – carbon/ceramic → SiC/SiC, NBR → FKM/EPDM, O-ring pusher → cartridge.
Wholesale economics – factory-direct pricing, OEM/ODM/private label, custom box, laser marking, SKU mapping.
Cross-reference team, not a chatbot – pump model + shaft diameter + old seal photo + fluid + temperature + pressure → confirmed part number.
Quality that protects your name – ISO 9001, lapped faces, leakage testing, material traceability.
Q1: If a customer asks for John Crane Type 1, can I offer Burgmann MG1 or Miaoyu MY-T1 instead?
In most general-water duties, yes. Type 1, MG1, AES W01, Roten Type 1, and Miaoyu MY-T1 share the single-spring rubber-bellows concept. But always confirm shaft diameter, stuffing-box depth, rotation direction, and elastomer before shipping.
Q2: Which Flygt seal should I always keep in stock?
Start with 3068, then 3085, 3102, 2066, 2102. Flygt submersible service is repetitive: lift stations, stormwater, wastewater contractors.
Q3: Grundfos CR cartridges—what sizes sell first?
12, 16, 20, 24, 28, 32 mm. Stock EPDM first, NBR second, FKM only for chemical/MRO niches.
Q4: Are Miaoyu seals “genuine” John Crane / Burgmann / Alfa Laval parts?
No—and that’s the point. They are OEM-interchangeable equivalents, built to original dimensions and duty range, often with upgradable faces and elastomers. Not counterfeit OEM parts; replacement components for distributors and MRO buyers.
Q5: How do I avoid cross-reference returns?
Never quote on “35 mm John Crane seal” alone. Collect pump make/model, shaft size, seal tag, fluid, temperature, pressure, RPM if known. The fifth data point saves the shipment.
John Crane = your quotation dictionary
Burgmann = your engineer-grade process line
Flygt = your municipal repeat business
Grundfos = your high-turnover metric cartridge line
Alfa Laval = your premium food/pharma margin line
Stock by customer panic, not by catalog page. One factory that speaks all five languages, cross-references fast, upgrades materials, private-labels your box, and doesn’t disappear after the first container—that’s the wholesale seal partner.
Our company is specialized in the production of sealing materials, mechanical seals , cartridge seals.
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