Jabsco 17255-0003-P Nitrile Impeller Kit, 6-Blade

A flexible impeller is the heart of a Jabsco pump, and it's the part that wears out. This is the Jabsco 17255-0003-P, the nitrile replacement impeller sized for the 17255-0003 and 17215-0000 pumps. If your pump has lost its prime, dropped its flow, or started weeping past the cover plate, a fresh impeller is almost always the fix. We keep these on the shelf because they're the one service part every pump owner ends up needing.

Here's how a flexible impeller works. Six rubber blades sweep around inside the pump housing, and because the housing has a slightly offset cam, the blades flex as they pass it. That flexing is what pulls water in on one side and pushes it out the other. It's a positive-displacement design, so it self-primes and moves a steady volume every turn. Simple, reliable, and the reason these pumps have been around forever. The trade-off is that those rubber blades are a wear item. They flex millions of times, they see heat, and eventually they take a set or start to crack.

This one is molded from nitrile, not neoprene. That matters more than it sounds. Nitrile stands up to oil and fuel far better than neoprene does, so it's the right choice when you're pumping anything with a trace of oil in it, or scavenging a bilge that isn't perfectly clean. The 17215-0000 and 17255-0003 pumps get used for all kinds of transfer and utility jobs around a boat, a shop, or a farm, and nitrile is what lets one impeller handle both water and oily water without swelling up.

The specs are straightforward. It's a 6-blade impeller, 40 mm across the body, 19 mm wide, with a 6.4 mm shaft bore. It's the Profile D shape, which is just Jabsco's way of matching the impeller geometry to the right pump family. Make sure your pump is one of the ones listed and you're set. If you're not sure, pull your old impeller and count the blades and measure the width before you order. Matching the exact part number is the safe move.

The kit ships with a cover gasket or O-ring, and you want to use it. Every time you pull the cover plate to change an impeller, that seal gets disturbed. Reusing an old, flattened gasket is how you end up with a slow drip at the cover plate a week later. Fresh seal, every swap. It's a two-dollar habit that saves you a repeat job.

Installing one isn't hard, but there are a couple of things worth knowing. First, lubricate the new impeller before it goes in. A little water, or a dab of the lubricant Jabsco recommends, lets the blades slide into the housing and take their curve without fighting you. Second, pay attention to which way the blades lean. Flexible impeller blades bend back against the direction of rotation, and if you run the pump the first time with the blades set the wrong way, you can tear one right off. Seat it so the blades trail correctly for your pump's rotation, snug the cover plate down evenly, and you're done.

The single most important rule with any flexible impeller pump is this. Don't run it dry. The water moving through the pump is what lubricates and cools those rubber blades. Run it dry, even for a short time, and the blades overheat against the housing and shred. That's the number one killer of impellers, and it's completely avoidable. Make sure the pump has a water source before you spin it up, and shut it down if the flow stops.

When an impeller does finally give up, it usually loses a blade or two. If that happens, track down every missing piece. A chunk of rubber loose in the system can lodge downstream and block flow, and then you're chasing a second problem you didn't need. Pull the broken impeller, account for all six blades, and clear anything that broke off before you drop the new one in.

Because this is a wear part, the smart play is to keep a spare aboard or on the shelf. An impeller failure tends to happen at the worst time, and having the right one on hand turns a stranded afternoon into a fifteen-minute job. Buy the one that matches your pump, keep it somewhere cool and dark so the rubber doesn't age before you need it, and you'll always be ready. Nitrile holds up well in storage, but like all rubber it's happiest out of direct sun and heat.