I think I bought the same thing a while back, but haven't gotten far enough to hook it up yet.

I think they are just made to be water resistant. I think you might have to put it on with sealant on the threads to make it waterproof. Another way might be to use the white teflon tape that plumbers use on the threads.

The water won't be under too much pressure to get in (unless you sink your kayak ) so it probably isn't that critical.

I'll be interested to see how your test works out.

Dale

: Hi All,

: I was down at the local Radio Shack yesterday looking for the bits and pieces
: needed to hook up an electric pump in my kayak.

: While there, I found a rubber cap that goes over the top of a toggle switch
: and makes it WATERPROOF. You still need to seal the switch into a
: waterproof box but the problem has always been the part sticking out of
: this box.

: They come in 2 sizes. The part number is 275-1598 for the larger size and
: they cost me $4.99 Can. for two; one red, one black.

: I now have all the pieces for the system so I will put the switch and box
: together tomorrow (I left my soldering iron at work!), throw it in a sink
: full of water and let you know how it worked.

: Ian