MIFAB's MWH series water hammer arrestors feature a thick-walled seamless copper body. This unique design eliminates the need for an end cap, ensuring maximum integrity and guaranteeing free movement of the piston for maximum performance. The ribbed piston design reduces secondary shock and the flared piston skirt prevents hard particles suspended in the water supply from contacting the o-rings to provide increased product life. A large volume air chamber provides superior water hammer arrestor performance. MIFAB, Inc.