Sentinel thief hatches are designed for simple operation, low maintenance and HIGH efficiency.  Vacuum valve units are interchangeable on all thief hatches and all seats are precision ground to hold accurate pressure and vacuum.  The S-10 and S-22 models feature a 2-Stage bleeder latch operation for operator safety.  

Click on a picture below for product details and/or parts information.

S-8A	S-10
S-22	AR