November 2012 Issue
Table of Contents
Last spring, I purchased an LED anchor replacement bulb from Imtra. I spent a lot of time trying to determine what base design I had in the Hella 2492 fixture, and I thought I had got it right.
When we tried to swap the bulb out with the OEM incandescent, the bayonet socket on the bulb had offset pins, and the fixture called for in-series pins. I went to Imtra to get the right bulb, but they do not make it in cool white, so they kindly allowed me to return the bulb for a refund, even though the bulb base was dented during the attempted install and the bulb had to be scrapped.
Len Zawistowski Zagloba, Catalina 310 Erie, Penn.
Mailport: November 2012
Antifreeze vs. Rubber
Does non-toxic antifreeze adversely affect rubber parts in marine plumbing? I just encountered an odd problem with the rubber parts in my three-year-old Jabsco head. The rubber of the flapper valve at the bottom of the pump and the joker valve both have enlarged. The flapper lengthened enough to hang up on the gasket portion, preventing it from sealing totally. The joker valve swelled to the point that it was a push to fit it in the discharge elbow. The only thing that I can think of that might have caused this is the non-toxic antifreeze that I use for winter storage.
Not all non-toxic antifreeze products are safe for use in plumbing systems. Those that are propylene glycol-based and are rated for plumbing should not damage the rubber; however, non-
toxic alcohol (ethanol)-based plumbing antifreeze can attack rubber. But the alcohol antifreeze typically dries out the rubber, not distorts it.