SW-4-SS-8 Superb Filter Housing Wrench (Stainless Steel)
Product Review (submitted on February 26, 2013):
Highly recommend this wrench. I tried the flimsy plastic wrench worked OK for awhile until it broke. Then I bought one of those "band" types of wrenches used for cylindrical objects. I must have over-tightened the Big Blue as that didn't budge it. Bought this wrench and it came off with ease!