70 battery vent tube

[Lawrence M.]

Re: 70 battery vent tube

Joe, are both tubes on your car the same O.D. and I.D. ? In the picture you posted the smooth tube appears to have a larger O.D. than the ribbed tube.

All-----

Completely peripheral to the primary topic here, there's something really curious about these tubes. First of all, as back ground, understand that the ribs seen on rubber tubing usually represent a code that identifies the manufacturer of the tube. Also, the same tubes, GM #3812819 and GM #3769512, were used from 1968 through 1975. The fact that there were two part numbers tells us that neither number represented bulk tubing. If the tubes were cut at St. Louis from bulk tubing, only one part number would have been necessary. In addition, the fact that one hose had ribs and the other not indicating different manufacturers is also consistent with each tube being a discrete, pre-made part.

Now, the curious part. The tube of part number 3769512 was released sometime in 1958. The tube GM #3812819 was released sometime in earlier 1962. So, both these tubes were originally released long before they were first used in any Corvette. Consequently, they must have been used for some other Chevrolet application. However, since they were PRODUCTION-only pieces, I cannot determine what those applications were. Perhaps windshield washer hoses for some application?

[Joe L.]

Re: 70 battery vent tube

Joe, are both tubes on your car the same O.D. and I.D. ? In the picture you posted the smooth tube appears to have a larger O.D. than the ribbed tube.

Larry-----


There might be a very slight difference between the two ( a few thousandths by the best measurement I can get) but it's probably within the manufacturing and/or specification tolerance for that size tubing. Certainly, there's no functional need for different sized tubing.

[Jeff S.]

Re: 70 battery vent tube

Jeff

Thankyou for showing us the hoses, I was just hoping I found some for my car, there is no problem at all. Jeff