Last edited by twobit; 11-28-2017 at 05:38 AM. Reason: add model number
A model number may help others find a part number for you.
It looks like that connector is no longer available, at least that is what the Sears parts site says.
They also do not give a replacement part number for it.
If the two tubings are 5/16 and 1/4 then the following should work.
https://partsdr.com/part/4373559-tub...ctor-1-4-5-16/
You could also try Home Depot etc.