Formerly a decent American made product with a 6 inch spark gap as shown in the product photo. The new ones are made in China with a 1-1/2 inch spark gap. Now they are only marginally effective, nowhere near as good as the old ones. Disappointing 3/4 inch Watt hydraulic shock absorber. Cost about $75 including $30 for brass hardware purchased from my local home center (orange). Yes, not cheap, but the pipes are quiet now.
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