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Marine
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The products

Marine lubricant

By Dwight Davis, Founder

On this page11
An oil, in a locker, in motion, for a season. Every word of that is a sealing requirement.

What it is

Gear oil, engine oil, two-stroke oil, grease and corrosion inhibitor. Viscous, non-aqueous, and the category the Clean Water Act regulation names directly.

Which the archetype does not describe

home-spray says thin, aqueous and sprayed. A gear oil is none of those, and the group it sits in was built around a cleaning spray.

What it actually needs

An HDPE or PP container, a spout or a wide enough neck to pour thick oil, a closure with a liner that resists it, and a shape that stows.

The spouted closures are the relevant ones

26 of them. Pouring gear oil into a lower unit is a controlled pour into a small opening, and a spout is what makes it possible without a funnel and a spill.

HDPE is the material

166 of the 354 containers. Tolerant of oils, tough, and the standard resin for this duty, with 39 packer bottles and 43 cylinder rounds across the shelf.

And the F style bottle is the stowage answer

12 PE F style bottles. Square in plan, so it packs into a locker without the dead space a round bottle leaves, and it does not roll.

Does not roll is a real specification here

A round bottle in a cockpit goes over the side or under a seat. A square or oval section stays where it was put, which no other property in this library cares about.

Size against the season

An owner needs enough for one or two changes. 101 containers over a pint and 45 over a quart, which is the right range, and the 13 over a gallon belong to the yard.

The liner is the specification nobody writes

11 liners and sealing discs on this shelf. For an oil in a locker through a winter, the liner is what decides whether there is an oil film under the container in April.

Test it the way it will live

Filled, sealed, on its side, shaken, through a freeze and a thaw, for six months. That is the actual duty cycle and nothing shorter tells you anything.

References

40 CFR 110.3, discharge of oil in such quantities as "may be harmful" under section 311(b)(4) of the Clean Water Act. Such discharges are those that "(a) Violate applicable water quality standards" or "(b) Cause a film or sheen upon or discoloration of the surface of the water or adjoining shorelines or cause a sludge or emulsion to be deposited beneath the surface of the water or upon adjoining shorelines". law.cornell.edu
The archetype behind this shelf is home-spray: 350 to 1,000 mL, narrow mouth, trigger sprayer, PET and HDPE, cold fill, thin, aqueous, sprayed. Its stated reason is "cleaning spray. Trigger sprayer, lockable, chemical resistant." All three leaves sit on it, and the shelf carries two trigger sprayers out of 526 closures.
The Davis Pack Supply catalog, measured 18 October 2026. The marine shelf is 880 rows: 354 containers and 526 closures. 50 mL to 3,785 mL with a median of 237; 101 containers over a pint, 45 over a quart, 13 over a gallon and none over five gallons. 166 HDPE, 117 PET, 71 PP, and no glass or metal at all. 163 jars, 159 bottles, 19 tubs and pails, 12 jugs, 1 tube. 136 white, 83 natural, 54 clear, 39 black, 20 amber. Closures: 368 continuous thread, 39 child resistant, 26 dome lids, 26 spouted, 18 flip top, 11 liners and sealing discs, 10 round tubs, 7 specialty, 7 buttress, 6 phenolic, 2 trigger sprayers.
Written from 40 CFR 110.3 and 33 CFR 155.450, and from the catalog as it stood on 18 October 2026. The Vessel General Permit, the Vessel Incidental Discharge Act and in-water hull cleaning rules are named and not summarized; state and local rules on boat washing and marina discharge vary by water body. Whether a specific product may be used in the water is a question about that product and that water.