I use this extension on the Chapin Premier 1 Gallon Sprayer (#21210XP). It makes the need for having to hunch over while spraying insecticide outside the house and in the gardens so much easier. Doesn't leak and I can stand upright with ease now. Plus I can spray in bushier plants much easier now without having to be a tai chi expert and trying to reach inside those plants! I just insert the wand into those plants and I can reach the areas I can't see so much easier! This makes spraying on longer reaches much easier and it makes the job much faster. I definitely recommend this for anyone who is tired of hunching over while spraying - you're back will thank you for it!
Bought 24 inch brass extension 2 months ago & used it several times. Very impressed with the quality and its performance in those hard to reach places. Just remember that when you change out original spray wand that all o rings are in place and tighten to avoid leaks , other than that I would consider buying this product in the future and recommend it to friends.