PVC Insulated Cable as standard, (Optional LSOH cable). M20 to M75 as standard, other thread forms available on request. Different thread sizes and types are permitted each end of the adaptor. These thread sizes may differ by one size only. If longer cable lengths than standard are required, advise length in millimeters. The 383 is manufactured in Brass, Nickel Plated Brass and Stainless Steel.