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Service ports W/rubber ball valve cores
This is the High side service port on GM and others . I have replaced several to lots of these service ports. Has anybody found a better system than the OE type fitting with Ball type valve. The Napa part # is 409521 , unsure of the GM # . If someone has found... Login to read more. 
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32 Replies Received
32 Replies Received
| Engine | 4.3 L |
| Trans | 4-speed Automatic (Electronic) |
Vehicle Data
2001 Chevrolet Blazer LS 4.3L
| Engine | 4.3 L |
| Trans | 4-speed Automatic (Electronic) |
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