4 90 DEG MS S.R

In hydraulic and piping systems, a 90-degree elbow is used to change the direction of fluid flow by 90 degrees. A 'short radius' (S.R.) design means the centerline radius of the bend equals one times the nominal pipe size, making it more compact than a long radius elbow. You would typically replace this on heavy equipment or industrial setups when the original fitting has become corroded, cracked, or is leaking.