Had a look at the leaking valve yesterday. It turned out to be a old model Frost Free Silcock with no Vacuum breaker assembly. This things is badly damages. First of all, the shut off valve washer (Bibb washer) screwed to the far end of the stem is damaged. Secondly, the screw attaches the handle to the valve is so rusted that I can not unscrew it (I did applied a fair amount of WD40, and it wouldn't budge a bit); The o-rings of the stem packing were broken (I saw debris of the o-rings);The bibb washer seat appears to be damaged (11 o'clock position from the picture).
I did replaced the washer. Because I can not get the handle screw removed, therefore the handle, I was not able to remove the stem packing from the packing nuts. I then couldn't replace the o-rings. The damages washer seat is what I am seeking for information about.
Is washer seat for Frost Free Silcock replaceable like those of bathroom faucet? I talked to couple of guys in the hardware stores. Some of them said it might be, some said it is not. All model in the stores have built in seat though. With a long enough Hex screwdriver, I might be able to see if it can be removed, but there is no where I can find one long enough.
If I can not fix it from outside, I will have to break the wall in my finished basement to create an access panel and have the whole thing replaced which represent a fair amount of work and some cosmetic work of the wall once done, because of the way the house was built, no access panel for anythign. This is the last thing I want to do.
Let me know what your guys think. Thank you.