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Frostproof Sillcock Recommendations

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About 5 years ago, I replaced the frostproof sillcock that comes out the back of the house. So you're sure what I'm talking about, it's about 12 inches long and has a very long stem that shuts off the water inside the (heated) house so the pipe never has a chance to freeze. Well, this summer the sillcock started to drip a little. First only when the sillcock was turned on, but recently even when it was turned off. This leak is not the packing washer, but the (custom) washers/O-rings that are at the end of the stem (the part inside the house). All I need are the correct (custom) washers and O-rings to fix the leak. I called several supply houses and eventually the manufacturer, and couldn't find the parts anywhere because they are made specifically for each sillcock. I gave up and removed the old sillcock and I'm going to replace it with a new one. But this time, I'm going to try to find one where the washers and O-rings are available, and buy and extra set now and store them until I need them. Can you please recommend a brand of frost proof sillcock where replacement washers/O-rings are available?
Mansfield model 578 would be my choice.
It is a brand that also sells replacement parts as a kit with all the parts to rebuild the sillcock.
The Mansfield 578 sillcock is about $25 which comes in 1/2" solder or 1/2" ips. with a 3/4" hose connection. It is available in 6", 8", 10", 12", and 14" in length.

It's about $9 for the Mansfield Sillcock Service Pack Kit #630-7755. The kit comes with all the needed parts for a complete rebuild.
I have a 500 series Mansfield frost free sillcock. I just picked up the various kits. The plastic handle is starting to crack inside, so I'll replace that. The faucest is leaking when in use. In order to replace the internal parts from the kit (630-7755), does the entire sillcock need to be removed, or is there a way to do this work w/o disconnecting from the tubing inside the house??
Figured it out... was afraid to just try to yank the dang assembly out, but that's what I did... saw all the original rubber washers in rough shape. Replaced all with the parts from the kit, put on the new handle, and presto... no more dropping. Shuts off smoothly and completely, and dripping from the handle while it's running (which was the big problem)
Glad we could HELP! Very Happy
I would like to replace the outdoor faucet but I cannot get the screw to come off. Can I saw off the handle to get to the bonnet under it?

<<was afraid to just try to yank the dang assembly out, but that's what I did>>

How did you actually take it off? Does it unscrew?
I would like to replace the outdoor faucet but I cannot get the screw to come off. Can I saw off the handle to get to the bonnet under it?

<<was afraid to just try to yank the dang assembly out, but that's what I did>>

How did you actually take it off? Does it unscrew?
[I recently replaced two faucets . One in front of my house and one in the back. I put on brand new mansfield sillcock faucets. Mansfield by Prier. Model # 478-12. Both were sweated on to my copper pipes. After attaching my hoses on both. They both leak at the Plastic valve on the top and around the nozel. I took one of the stems out to see if the washers were by chance melted doing soldering but they were fine. I purchased a new Replacement part pack number 630-7755. and put it in one of the faucets. They both still leak . What is the problem? A neighbor told me not to buy Mansfield because they didn't last as long as other models. I explaned i just bought them.
Please advise. Thanks George

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