|Source for Allazzurra Oil Level Sight Glasses by Dennis Martin
Look in MSC Supply Co www.mscdirect.com for Oil Level Sight Glasses. They come in BSP pipe and Metric sizes. The first one on the metric list is #64829252. They come in various sizes - Metric and BSP - and with either natural glass with Buna-N, or ESG(?) glass with Viton O-ring. Not sure I know which is appropriate, or what size is needed. They are rated to 100degC, which may not be quite enough, but at about $10/15 each, might beworth a try. There are cheaper ones made of plastic at $2.50 to $6.00 aswell.