Rotary Tank Spray Cleaning Ball. Made from 304 Stainless Steel. 1/2″ Female Connection with ball dia 40mm and cleaning radius 0.5-1.5m.
8/27/19 12 AM Central: This is selling for $18.99. That’s $1.40 shy of the best historical third party Amazon price I found, notwithstanding Lightning Deals or coupons. Shipping is also free to many US addresses with Prime Membership [Try Prime for Free] or a qualifying order. Prices, shipping and availability can change quickly. Please note that product prices and availability are subject to change. Prices and availability were accurate at the time this post was published; however, they may differ from those you see when you visit Amazon. Check the product page for current price, description and availability. Also: Recent Amazon Finds and Amazon Fillers Resource Page