My 53 has the valve. You can have mine if you have the time to wait until I get back up to Wisconsin as I am converting mine to a diesel.

However my grandfather was in the plumbing business for a long time and owned a hardware store for a while in the 50's-70's. I have seen the vary same valve in the hardware bins in his storage shed before he pasted away.

The problems we face today can not be addressed at the same level of intelligence we were at when we created them - Albert Einstein Or with the same level of $ - Me