All cast iron construction for superb durability 1in. inlet tube provides easy installation with a hose clamp SAE straight thread O-ring outlet port prevents leaking 1/2in. dia. x 1 1/2in.L straight keyed shaft provides dependable performance Delivers up to 11 GPM max. at high flow, 1.1 GPM minimum at low flow This super durable two-stage Concentric Replacement Hydraulic Pump is a drop-in replacement pump for all MTD log splitters using a hi/low pump with part# 718-04127. Delivers up to 3,000 PSI. 100% tested and inspected to ensure quality and performance.