Housing without flange in machined and hardened steel. Inner thread at the bottom for fxing by means of screws or threaded rods. Machined steel cover cap.* Felt sealing system.** Available in steel, zinc plated steel, stainless steel. Balls made of chrome steel, AISI 420C stainless steel, plastic material. * SBM 12 in pressed metal sheet. ** Except SBM 12 – 15 and types with the large ball in plastic material.
