The outside diameter of the B&G Plastic Crack & Crevice 6 in. Extension Straw (5700-B) is 0.085". The inside diameter is 0.026.
The B&G 6" Plastic Crack-Crevice Extension Straw (5700-B) 22049200 fits into the Multeejet Crack & Crevice Tip B&G Part 5800-CC that is part of the Multeejet C&C Tip Assembly (complete) B&G Part 5850-CC. These B&G Parts are not interchangeable with other model sprayers.