RIDGID 31175 Model 1017 Basin Wrench, 10 inch to 17 Telescoping Wrench

Amazon

Spring-loaded jaws made of tough forged alloy steel provide fast, one-hand ratcheting Tension plug holds the head in any position up to a 90-degree angle Telescopic shank quickly adjusts in length from 10 inches to 17 inches Adjustable basin wrench is ideal for use in tight spaces and under-sink applications Telescopic basin wrench has a 3/8-inch (10 mm) to 1-1/4-inch (32 mm) pipe capacity

Zoro Tools

Forged steel jaws, spring loaded to easily grip nuts behind sinks and basins. The head can be positioned at any angle up to 90. Solid steel square section handle with sliding tommy bar.