Delta style. 3/8 compression x 3/8 od x 12. stainless steel. lead free connector. for use on delta faucets that have copper water supply tubes coming out of the bottom of the faucet. wetted surface of this product contacted by consumable water contains less than 1/4 of 1 percent. 0.25% of lead by weight. meets ab1953 California & vt s152 Vermont low lead restrictions.