Stainless Steel Stud Bolts Kit for 18590 Series Run-Dry Macerator Pumps by Jabsco®. Replaces studs, nuts and washers in older models. Jabsco's industrial liquid handling products include state-of-the-art hygienic rotary lobe pumps for foodstuffs, dairy products, pharmaceuticals and bio-tech process liquids. Fits 18590 Series Run-Dry Macerator Pumps.