Lock nut provides positive and safe mechanical load holding Low friction locking rings spin easy, save time and effort Designed to withstand 10% side-load up to 90% of maximum stroke Hardened surface resists side-loading and cyclic wear Overflow port as stroke limiter to prevent plunger blow-out Weather protected, inside and out Replaceable bearings enclose the plunger for support throughout the stroke Certified lifting eyes and base mounting holes