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Only the manufacturer of the Onga 443 MAY be able to tell you how old your pump is. You would have to provide the serial number for the pump, in hopes the company has manufacturing records in its archives. The company archives should probably have photographs of the Onga 443.
I refer you to Pentair, the oompany which owns the Onga brand name and manufactures the pumps. See the Pentair Contact Us page to find the email address for Customer Service: http://www.onga.com.au/contact-us/
The email addresses there seem to be for sales. I would still use the email address for the country where you reside and ask that your message be forwarded to Customer Service.
The pump appears to be a centrifugal pump and the inlet will be the one leading to the centre of the impeller. You should find a manual at the link below...
Your Onga Pool pump was running dry causing the impeller to melt down and stick to the pump case. You have to remove the impeller, and the only way to take it off by using the heat gun to melt the stucked plastic impeller. Or by forcing it off slowly, cutting the impeller using hacksaw, taking care of the mechanical seal and the motor shaft not to bend it. Afterwhich you can replace the impeller, and assemble the Onga pump/motor. Then, you can install the Onga pump back to its location. Just send you e-mail for further assistance. God bless you.
It is leaking due to a defective mechanical seal. It needs to be replaced. To replace it, is to take the pumpcase off by taking off the bolts that hold it. Then, take the impeller off to take the mechanical seal behind it. Put the replacement in, and reassemble the pump. Just get in touch with us by e-mail to get more assistance.
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