Renwal Manufacturing Company started producing plastic dollhouse furniture in 1945. Charles F. Donovan, Jr. has published a wonderful reference book, Renwal, World's Finest Toys, for collectors of this vintage furniture. This particular kitchen set was produced in 1948-50; and was probably sized for 6-8" dolls as the sink and stove are 4" by 6", while the fridge is 7" by 4" ....much too large for most dollhouses.
The sink came equipped with scaled packages of soap, soap powder and cleanser...plus a sink stopper. Turn the faucets and water comes out! Not exactly, Donovan explained that water flow operated by gravity whether the faucets were "on" or "off". And since my sink didn't come with a stopper and I couldn't find a replacement item, I had a lot of fun taking the next picture!
And here is a picture of that original kitchen set that got me started .... next to this super BIG set that must have delighted a lot of small girls back in 1948!