The CCH2O bulkhead wrench is designed to easily and securely tighten both the 2” and 3” UC Spin Tight Bulkheads. The reinforced, heavy-duty design of the CCH2O wrench offers years of use. Compatible with 2” – 3” bulkheads by simply switching sides. Constructed of durable ABS and recyclable. Made in California. Included with all Under Current systems.