... casting experience 2: ISO 9001 Certification 3: OEM /ODM Service 4:Accept customized About us: Ningbo Surely Metal Technology Co., Ltd ... . 3) Suitable for various industries: auto, machine, valve, pneumatic , etc. 4) Whole process including: Tooling, Die casting, Sand casting, Gravity casting ... there is any question on our production. aluminum die casting mechanical seals for pumps