Comparison : Item # 504089 (suitable for pressures thru 4 light spiral hose-SAE 100R9), SAE Swivel Flange/Split Flange SAE Standard Pressure Series (Code 61) 90 Degree
Item # FF5321 (suitable for pressures thru 4 heavy spiral hose-SAE 100R10, SAE Swivel Flange/Split Flange (Welded) SAE Standard Pressure Series (Code 61) 90 Degree