BULKHEAD FITTING, 3/4” FPT, 1-5/8” HOLE Hotsy Pacific Sale! from $21.50 Qty. Add to Cart This item is currently on backorder but you can still purchase it now and we'll ship as soon as more become available. Black Polypropylene Double-Threaded with EPDM Gasket Opening Same Size as Outside Diameter 3/4" FPT Hole Diameter: 1-5/8"