How "old" is this JAVELIN? I am basing my answer on this being a 1973 or later model.
The (1973-85) Javelins and the DS II have the same self-bailer. Joe, there are no hoses, the bailer goes right thru hull and cockpit sole, water collects i na shallow well at aft end of cockpit and there is a "gutter" along each side of the cockpit to direct water aft to that well. The boat will "self-bail" when under way, suction is created by the water moving past the backwards "scoop" of the bailer. This is also the same bailer used on the SUNFISH sailboat. Anyway, yes, the bailer does let in a bit of water at rest. But if yo uget rain it will drain out once the water builds up higher than the outside waterline, ideally..... there is a little plastic ball inside the bailer that is SUPPOSED to seal the drain against water entry.......then if you get water inside the cockpit (due to rain, spray, or taking water over the lee rail) the water inside will pus hthe ball down enough to allow the inside water to drain. Yeh, Right! That is how it is supposed to work!! In reality.......well, a bit of water usually does flow in through the bailer at rest..... in 15 years of owning my DS II, I've yet to find a way to get the bailer to work as it should. So, I gave up...... the plug in the bailer is left open while moored to allow rai nto drain out, and while sailing or otherwise using the boat....I insert the plug to keep water out (easy enough to pull the plug out of the bailer if I took water over the side.) If I leave the boat in the water with a lot of rain forcast (and I mean a LOT!!) I usually remove the 1" plug that is higher up on the transom.......that way the water should never get higher than than that (yes ,water does flow in through that too..... but still better than depending on that little 5/8" hole i nthe bailer for draining a major amount of water.