Water Hammer Arrestors - Connexion Developments- industrial water hammer arrestors ,Water hammer arrestor types. 1. The inverted air pocket water hammer arrestor. Basic anti water hammer device, simple by design, no moving parts, cheap and easy to make. Works on the principle that air being 25 times lighter than water will be trapped in a vertical vessel and act as a shock absorber. Water in the pipe below the air pocket will ...Flexicraft Hydropad Surge SuppressorFlexicraft manufactures the Hydropad hydraulic accumulator, which has all stainless steel wetted parts using an edge welded metal bellows for outstanding fluid control performance in applications such as surge suppression.