These heavy duty "live swivels" are designed for air, water, or oil pressure up to 5000 PSI. They are commonly seen where a hose connection moves or twists to prevent damage or kinking.
New-Line Stainless Steel FPTxMPT 5000 PSI In Line Swivel
Really great product and I highly recommend this product. Spray on, spray off, leaves a nice deep shine and super smooth feeling. Works well on my customers vehicles and it’s lasts a strong 2 months. Excellent protection