Krowne21-528L Royal Series Quick Connect, for mounting All Silver Series faucets on 12-8XXL, Low Lead Compliant​‌‍​​‌‌​​‍​​‌‌‌‌​‍​‌​​‌​‍​​‌‌‌‌‍​​‌‌‌‌‍​​‌‌​​‍​​‌‌‌‌‍​​‌​‌‌‍​​​‌‌‌‍​​‌‌​​‍​​‌​‌‌‍​​