There are have  two designs of PL420/PL270 filter head with pump. In the left side, it's the NEW PL420 the right side, it's the OLD PL420 SEATING.

Compare the New design PL420/PL270 and the old design PL420/PL270: 

1.Hand Pressure Pump:

The New hand pressure pump use the 0.8mm iron, and the old hand pressure pump use the plastic.

The New PL420 hand pressure pump: 

The old PL420 hand pressure pump:

The old hand pump failure situation is very common, especially in the low winter temperatures, frequent fracture.

2. Check Valve:

The New PL420 seating use the three hole design,inlet flow is greatly improved.

The Old PL420 seating:

3. The check valve for red imported finished silicon rubber, high temperature range is -45 to 135 degrees celsius. Black  valve for the domestic butadiene acrylonitrile rubber, flexibility is poor, easy to aging and loss of pump oil check function. The new red valve and the aluminum base seal with a high quality of nitrile rubber O - ring, seal performance is far beyond the old section of the aluminum to aluminum and glue sealing.

 

 

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