Mechanical Seal 4MC-22B Vertical Multi Stage Grundfos Pump Seal 4MC-22B With Flange

‌Direct Pain Point Version‌
Tired of seal failures causing unexpected pump downtime and costly warranty claims?
As a hefei-based mechanical seal factory with ISO 9001 certification, we deliver drop-in replacement seals and custom-engineered sealing parts built exclusively for pump manufacturers. Our full portfolio covers Flygt, Grundfos, APV and nearly all mainstream pump brand equivalents, plus single spring, multi-spring, cartridge balanced, PTFE and metal bellow seals — all 100% performance-tested to match or exceed original sealing specs.
Whether you need seals matched to your supplied samples, produced from your technical drawings, or custom-developed for aggressive working conditions, our in-house team delivers production-ready units in 10–20 days. Free standard samples are available, with secure PayPal and T/T terms.
Upgrade your pump lineup with seals that cut after-sales maintenance and keep every unit leak-free, long after it leaves your factory floor.

‌OEM Partnership Version‌
More than a seal supplier — your long-term OEM sealing partner for pump manufacturing.
Headquartered in Ningbo, China, we specialize in manufacturing, exporting and customizing industrial mechanical seals built to integrate seamlessly into your new pump assemblies. Backed by strict ISO 9001 quality control, we deliver consistent, traceable sealing performance across every batch, helping you stabilize component quality and simplify your supply chain.
We support full OEM customization: seals manufactured exactly to your physical samples, produced strictly from your official drawings, or co-developed for your unique pressure, temperature and media conditions. Our full pump seal library covers Flygt, Grundfos, APV and dozens of other mainstream pump models, all validated for perfect fit and zero installation friction.
With 10–20 day lead times, free standard samples, and flexible PayPal and T/T payment options, we make it easy for pump manufacturers to lock in reliable sealing supply and reduce long-term after-sales service costs.

‌Production Efficiency Version‌
Keep your pump assembly line running — no seal shortages, no compatibility issues, no unexpected delays.
We are a Ningbo mechanical seal factory focused on serving pump manufacturers with high-volume, consistent-quality sealing parts built for fast, error-free installation. Every seal goes through multi-stage pre-shipment inspection under ISO 9001 standards, so your assembly team never wastes time reworking ill-fitting components.
Our product range includes all common spring, bellow, agitator and dry-running seal types, plus full direct replacements for Flygt, Grundfos, APV and most major pump brands. We turn your custom seal requirements into finished, certified production parts within 10–20 days, even for non-standard configurations.
Free standard samples are available for your factory testing, and we support secure PayPal and T/T transactions for global pump manufacturers. Stop letting unstable seal supply slow down your pump output.

1. ‌Are you a factory or a trade company?‌
   We are a professional mechanical seal manufacturer based in Ningbo, China, with our dedicated in-house international trade team to provide full-process export services for global clients.

2. ‌Can I get a sample before placing a formal order?‌
   Absolutely. Samples for most of our standard models are available free of charge, you only need to cover the international shipping cost. It is a very common way for our clients to test and verify product quality before bulk orders.

3. ‌Where is your factory located? How can I arrange a visit?‌
   Our factory is situated in Ningbo, China. You can take a direct flight to Ningbo Lishe International Airport, or fly to Shanghai Pudong Airport which is only around 2 hours' drive away from our facility. All clients, both domestic and overseas, are warmly welcomed to visit our production lines and quality control workshop at your convenience.

4. ‌What is your factory's quality control system like?‌
   Quality has always been our top priority. We implement strict full-process quality management from raw material incoming inspection, in-production parameter monitoring to final finished product performance testing. Our factory has been certified with ISO 9001 quality management system, to make sure every delivered product meets consistent high performance standards.

5. ‌What is your standard order lead time?‌
   For most standard models and custom sealing products, the delivery lead time is 10-20 days after we receive your prepayment. We will inform you in advance if there are any special circumstances that may affect the delivery schedule.

6. ‌What payment methods do you support?‌
   We offer flexible payment terms for different order sizes: for small sample shipping fees, both PayPal and T/T are acceptable. For large-volume formal orders, we support T/T at sight as the standard payment term.

7. ‌Do you support OEM and ODM customization services?‌
   Yes, we provide full-range OEM and ODM services for all our mechanical seal products. Our experienced engineering team can develop exclusive sealing solutions according to your specific working condition requirements, drawings or provided samples.

8. ‌Can I purchase pumps and related pump parts from you as well?‌
   Certainly. Besides the full series of mechanical seals, we also supply a complete range of supporting pumps and pump spare parts, including lobe pumps, compound & homogeneous pumps, homogeneous & emulsification pumps and other related fluid handling components.