There are seals inside the unit along with a smooth bore

WORKING PRESSURE Up to 145 PSI

Mechanical Resister with Long Shaft Part # BP-4210-30LS

Maximum of 150 PSI and 48 SCFM

Coxreels SH-Fuel Series EZ-SHFL-525 Airline Accessories There are seals inside theCoxreels SH Fuel Series EZ SHFL 525 Coxreels SH Fuel Series EZ Coil hose reels are designed to dispense various non aromatic fuel applications including diesel, kerosene, fuel oil and heating oil. The SH Fuel Series has a long history of reliable performance. The oversized chassis and frame handles longer lengths and larger diameters of hose. Coxreels original Super Hub dual axle support reel increases the stability during operation, reduces vibration