尼日利亚采购需求：电力供应不明、建筑供暖、水利、污水处理、石油化工、矿业和冶金

Please provide your most competitive pricing for the flow switches listed below, along with the necessary specifications. Specifically, I would appreciate the product datasheet, payment terms, delivery lead time, country of origin, price validity, and product weight to be included in your response. The items I'm inquiring about are two mechanical seals, each with distinct specifications. I'm looking to secure a total quantity of four units. Your prompt and detailed reply will be highly valued as we consider our purchasing options. Thank you!