Piston seals type GPU, made of polyurethane and NBR, must be used in working conditions within the following limits: - Pressure: 0 to 250 Bar; - Temperature: -30 to 100°C - Speed up to 0,5 m/sec. Please will contact our engineering department if you have particular operating conditions. Assembly: The assembly of piston seals GPU is not particurarly difficult because the material is elastic and the seals need a small housing. It is useful, though not indispendable, to lubrificate the seat and the gasket using the same fluid as in the system or chemically compatible lubricant.