T-H Marine Stainless Worm Gear Hose Clamps 1/4-5/8" 2pk

Every boat has a dozen small hoses doing quiet, important work. The fuel line running to the primer bulb. The feed hose on a livewell pump. A bilge discharge line, washdown plumbing, the little low-pressure runs you forget are even there until one of them starts to weep. When a connection slips or seeps, you want a clamp that holds and doesn't rust out on you a season later. That's what this pair of T-H Marine worm gear clamps is for.

The clamping range is 1/4 inch to 5/8 inch, so these fit the small-diameter hose you run into most on a rigging job. Think aerator and livewell lines, small fuel line, bilge and washdown hose, and the kind of low-pressure plumbing that lives behind the console and under the deck. You tighten them with a worm-drive screw. The band pulls down evenly around the hose and you dial in exactly the tension you want. Back the screw off and the clamp opens right back up, so they're easy to reposition or reuse.

They're stainless steel, which is the whole point on a boat. Saltwater and spray eat plated-steel clamps alive. Stainless holds up to the wet, salty, humid life down in the bilge and behind the livewell a lot longer. Keeping your below-deck connections on stainless hardware is cheap insurance against a slow leak you won't catch until it's already a problem. And it keeps that rust-streak look off your rigging.

You get two clamps in the set. That's handy, because small-hose jobs tend to come in pairs. Both ends of a run. A supply and a return. Or one on the job and one in the spares box for the next time something lets go at the worst possible moment, which on a boat is the only time things let go. Keep a couple of these in your onboard kit and you'll reach for them more than you'd think.

Picking the right clamp is mostly about matching the band to your hose's outside diameter once it's seated over the barb. You want the clamped diameter to land comfortably inside the 1/4 inch to 5/8 inch range, not way out at the end of its travel. If your hose sits right at 5/8 inch or a touch bigger, step up to the next size clamp instead of maxing this one out. A clamp working in the middle of its range seats better and holds its tension longer than one cranked to its limit.

Installation is straightforward. Slide the clamp onto the hose before you push the hose onto the fitting. Seat the hose fully onto the barb, then position the clamp over the barb's ridge and not past the end of it. Snug the screw until the band bites into the hose, then give it just a bit more. Don't go gorilla on it. Overtightening a small clamp can cut into soft hose or strip the worm screw, and snug-and-secure beats crushed every time. Check it again after the first few runs, since hose relaxes a little once it's seen some pressure and heat.

One honesty note. This is a general-purpose worm gear clamp sized for small hose. It's a solid, corrosion-resistant pick for the everyday low-pressure connections all over your boat. For high-pressure hydraulic lines, or anything where a failure turns into a safety issue, use the clamp spec'd for that system. And always size your clamp to the actual hose in front of you, not just to whatever's left in the drawer.

T-H Marine has been building boat rigging and plumbing hardware for decades, and this is the kind of simple, do-it-right part that reflects it. Two stainless clamps. A genuinely useful size range. No drama. Toss a set in your rigging kit and get back on the water.