小朱兄
         幫你跟購物網站及Dolphin原廠尋問過了 這幾年他們是有改變新的Seal Kit 
         不過依你的型號   應該是可以使用的  時間上不是個問題
         請你檢查馬達軸心那有一個黃銅做的環   請把它拿掉  如果沒有
        那應該在軸心內部葉扇那  想辦法拿掉    新的Seal Kit 不需要
        這樣就沒問題了 
原廠的回覆如下
Ben,
We changed seal styles in recent years.  The new seal you bought is the correct seal and it should work in your pump.  One thing you will probably need to do is check the motor shaft for a brass ring or spacer.  If this brass ring is on the motor shaft, take it off and throw it away.  You do not need it with the new seal.  If there is no brass ring on the motor shaft, check inside the shaft of the impeller to see if it is stuck in there.  You can tap the impeller shaft on a table or somethig to try and knock it out.  If you have any other questions, let me know.
Renee
Dolphin Pumps
850-434-9880