PCA Worm-Gear Clamp PCA Worm-Gear Clamp Description Over-sized worm-gear clamps specially made for use with PCA hoses and adapters. REQUEST A QUOTE Contact Information Product Attributes Notes and/or comments Please check the captcha box to proceed SUBMIT REQUEST FORM Specifications Specifications Available sizes (OD): 4″, 8″, 12″, 14″ & 24″.