... : ISO228 and NPT 2. Size :16*1/2",16*3/4",18*1/2",20*1/2",20 ... *3/4",25*1/2",25*3/4",25*1",32*1/2",32*3/4",32*1", ... 32*1-1/4"3. Raw Material : Brass.4. OEM service ... workshop as well. 2)All the products were 100% tested. 3) Factory is located in Wuhu City, 350km from Shanghai. 4 ... supports us very much. We have tax preference. compression fittings with O ring