so guys on my 78 glastron 188 there is this weird hole with a bilge style plastic insert in it it seems to be below water level but not sure since I haven't had it in the water yet I noticed in original pics of the 78 boat in the brochure its there so its a stock hole its on the front right side I noticed this boat had a cooler as a luxury and the plug goes to the open are under the front bow seat anyone know what this is