Wrot copper and cast copper alloy fittings from Elkhart products corporation are for use in plumbing and other mechanical applications. All 1/8 to 8 in fittings are manufactured in the United States at one of our three locations, Elkhart Indiana, Geneva Indiana and Fayetteville Arkansas. Wrot opper fittings are designed to join ASTM B88 and ASTM B280 seamless copper tube.