ForgeFit® Stainless Tri-Clamp End Cap Reducer | 4" x 1.5"Adapt any 4" tri clamp port to work with an existing 1. 5" tri clamp fitting or valve. Often used to connect tri clamp accessories to the dome port on stainless steel conical fermenters. 1. 5" x 4" tri clamp 1. 5" tall Made from 304 stainless steel ForgeFit is a brand of rugged, high quality fittings made from certified 304 stainless steel. Each fitting is backed by our 60 day no hassle return policy and a one year warranty from MoreBeer!.