Amazon.com: ZHUOMINGJIA 2 Sets 1/2 In PVC Bulkhead Fitting For Rain Barrels, Aquariums, Water Tanks And Ponds Dark Gray(2 pcs Bulkhead Adapter And 2 pcs Plugs+2 pcs Water Pipe Connector) : Industrial & Scientific
Oatey 3 in. or 4 in. PVC closet flange with plastic ring w/o test cap - Faucet Flanges - Amazon.com