Koch-Chemie "Dosing Cap" dosing cap for 1000ml / 270mm bottles 1 Stück

Dose concentrates dead-on with the scale on the Koch-Chemie Dosing Cap

What is the Koch-Chemie Dosing Cap? A 270 mm riser cap with a 20 ml measuring scale in 5 ml steps for dosing concentrates straight out of the Koch-Chemie 1-litre bottle. Not suitable for acidic or solvent-based products, and it doesn't fit canisters of 5 litres or more.

Koch-Chemie Dosing Cap is a dosing cap from Koch-Chemie (item no. 9998149) that works with a built-in 270 mm riser tube and a clear measuring scale from 5 to 20 millilitres in 5 ml steps. It replaces the standard closure on the 1-litre concentrate bottles and turns any bottle into a squeeze-driven dosing dispenser — no measuring cup, no splashing over the edge of the bench, no soaked labels.

• Scale in 5 ml steps up to 20 millilitres. One squeeze of the bottle and the concentrate climbs through the 270 mm riser tube into the clear measuring neck. You read off the amount and pour it straight into the spray bottle — for a Pol Star Po dilution at 1:10 that's exactly 10 millilitres, not "about a good glug" that you'll never hit again on the next bucket of wash.
• Riser tube can be trimmed for 500 ml bottles. From the factory the tube sits at 270 millimetres, a perfect fit for the Koch-Chemie 1-litre standard bottle. For 500 ml spray bottles you trim it down to around 175 millimetres with scissors — the same cap then keeps working on the smaller bottles, so you don't buy a second one and you don't give up a second slot on the shelf.
• Lasts 100 uses and up. With alkaline products and car shampoos the plastic holds up for several years day-to-day — with a weekly Pol Star wash that's a good two years of service. Spread across the 3.49 EUR purchase price, your dosing cost lands under 4 cents per use. For a tool that saves between 5 and 15 millilitres of concentrate per wash, that's a purchase that pays itself off in two weeks.

Detailing1's tip from the shop: Two mistakes cost you scale accuracy. First mistake: squeezing the bottle too hard — the concentrate shoots past the 20 ml line. Squeeze short and stop at the line instead. Second mistake: not flipping the little outlet flap on top open before you pour — then a vacuum pulls the liquid back, the bottle crackles, and the pour runs uneven. Manufacturer instruction: "Open cap when dispensing." So always flip the flap open first, then pour.

Screw on. Squeeze. Read off the scale.

The Dosing Cap screws onto the 1-litre concentrate bottle, you give the bottle a quick squeeze from the side — the concentrate climbs through the 270 mm riser tube into the clear measuring neck and stops at the 5 ml line you want.

In detail it goes like this: unscrew the original closure, push the Dosing Cap with its riser tube into the bottle, screw it down clockwise. Hold the bottle upright and gently squeeze the long sides with both hands — you don't need any force, a controlled squeeze of about a centimetre is enough. As soon as the concentrate reaches the first 5 ml line, ease off the pressure. Need more? Just give it another quick squeeze.

Real-world amounts from day-to-day work: for a Pol Star Po dilution at 1:10 for upholstery cleaning you dose 10 millilitres and add it to 90 millilitres of warm water. For Green Star "Gs" as a pre-cleaner you dilute 1:5, so 20 millilitres of concentrate in 80 millilitres of water — a full scale fill. For Active Foam "Af" in the foam lance container 1:20 is normal, so 5 millilitres per 100 millilitres of water. With the 5 ml resolution you're bang on the line for all three of these standard mixes.

When you pour, open the little flap on top, hold the bottle at an angle and let the measured concentrate run into your empty HDPE spray bottle or mixing container. Top up with water, fit the spray head, done. If you mix several dilutions per session, you save yourself the measuring cup and the leftover in the cup that otherwise gets spilled or tipped away.

Alkaline and shampoo: yes. Acids and solvents: no.

The Dosing Cap is expressly cleared by the manufacturer for alkaline cleaning concentrates and car shampoos. Acids and solvents attack the plastic of the scale over time — that's the most important limit on where you use it.

In concrete terms: across the Koch-Chemie range the cap fits the alkaline all-purpose cleaners Green Star "Gs", multi-purpose cleaner "Mzr" and Allround Surface Cleaner "Asc", the pre-cleaners Pre-Foam efficient "Pfe" and Pre-Wash B "Pb", Active Foam "Af" for the foam lance, the car shampoo "As", the NanoMagicShampoo "Nms" plus the upholstery care Pol Star "Po" and the plastic-care concentrates. That covers around eighty percent of the typical Koch-Chemie detailing workflow.

Where the cap is not suitable is Triple Acid Star "Ta" and other acidic wheel cleaners, Reactive Rust Remover "Rrr", Magic Wheel Cleaner "Mwc", and solvent-based products like stain remover "Fw" or tar remover. Acids soften the scale markings, solvents can make the plastic brittle — either way you lose the measuring accuracy after a few uses. For those products stick with the original closure or work with a measuring cup.

The second clear limit is the bottle. The riser tube is matched to 270 millimetres, so it fits the standard 1-litre Koch-Chemie bottle and, once trimmed, the 500 ml spray bottles. It doesn't fit the 5-litre, 10-litre or 25-litre canisters — those have a different closure diameter and too much height for the riser tube.

If you want to dose straight out of the 5-litre canister, you need a different solution like the CarPro Measure Cap, which screws onto 28/400-thread spray bottles and works on a decant principle rather than dosing straight from the storage container.

If you dose Koch-Chemie concentrates, you want it.

The Dosing Cap pays for itself from the second concentrate on the shelf. If you keep Pol Star, Green Star and Pre-Foam in 1-litre bottles, you mix two to three dilutions per detailing session — eyeballing it burns more concentrate over the year than the cap costs.

It breaks down into three profiles. For the hobby detailer with two or three concentrate bottles the cap is a one-off 3.49 EUR outlay that makes your own mixes repeatable — a 1:10 dilution is genuinely 1:10 next time, not "a touch too weak" or "a bit too foamy".

For the semi-pro and the workshop detailer who mixes several dilutions a day, the cap saves concentrate — a rough 15 ml guess instead of a measured 10 ml dose adds up to two or three litres of Pol Star too much over the season. The cap makes less sense if you only use a single ready-mixed spray product and don't dilute any concentrates at all — then you simply don't need it.

On the Detailing1 shelf, three building blocks make one complete concentrate mixing system: the Koch-Chemie Dosing Cap on the concentrate bottle, the HDPE cylinder bottle 1 litre as the mixing container and the spray head "Star" with spray bottle as the finished set. You dose from the concentrate into the HDPE bottle, top up with water, fit the spray head — three moves, a repeatable mix, no measuring cup in the sink. All in, the system costs you under twelve euros and saves you buying every separate spray-bottle component on its own.

If you mix several concentrates in rotation, label the HDPE bottle with a permanent marker along the bottom edge: dilution and date. Sounds trivial, but day-to-day it's exactly what sits between a repeatable workflow and a "not sure what's in here any more" mix.

The Dosing Cap itself stays on the concentrate bottle, the spray head stays on the HDPE bottle — you only swap the concentrate, and you always measure on the same 5 ml scale. That's the one Detailing1 tip that has nothing to do with the product and everything to do with the routine around it: standardisation beats improvisation, every time.

The handful of buyer reviews for the cap confirm the point that matters most in the product's logic: the fit on the Koch-Chemie 1-litre bottles is spot on. Verified buyers report matter-of-factly that the cap "fits", which on a riser-tube system with a fixed length spec is all that counts.

The real Detailing1 value isn't in the cap, it's in the discipline. Once you've dosed with a 5 ml scale, you never go back to eyeballing — and only then do you notice how much concentrate used to vanish into the bucket water, because a 1:5 dilution was really a 1:3 and the whole litre of Pol Star was gone after 8 washes instead of 20.

Using the Koch-Chemie Dosing Cap

Screw on, compress, read, pour

Unscrew the original cap from the Koch-Chemie 1-liter concentrate bottle counter-clockwise and set it aside. Insert the dosing cap's dip tube vertically into the bottle opening – it is 270 millimeters long and extends just above the bottom of the standard bottle. Then, screw the cap hand-tight clockwise. An additional quarter turn with tools is not necessary and can damage the thread.

Before dosing, always open the small outlet flap on top of the cap first – the manufacturer's instruction "Open cap when dispensing" ensures pressure equalization between the bottle interior and the atmosphere. If the flap remains closed, a vacuum will pull the liquid back into the dip tube when pouring, and the outflow will be uneven.

Place the bottle upright, gently squeeze it on the long sides with both hands. A controlled compression of about one centimeter is sufficient – you don't need much force. The concentrate rises through the dip tube into the transparent measuring neck. As soon as the desired 5 ml mark is reached (5, 10, 15, or 20 ml), release the pressure. If there is too much concentrate in the neck, tilt the bottle and let the excess flow back into the reservoir.

Pour the measured amount into your HDPE cylinder bottle or into the mixing container. Fill with water according to the concentrate manufacturer's dilution recommendation – for Pol Star Po 1:10, it's 10 ml concentrate plus 90 ml water; for Active Foam Af 1:20, it's 5 ml plus 95 ml. Attach the spray head, shake briefly, apply.

Notes: The Dosing Cap is approved exclusively for alkaline cleaning concentrates and car shampoos. Acidic products such as Triple Acid Star "Ta", Reactive Rust Remover "Rrr" or Magic Wheel Cleaner "Mwc", as well as solvent-based products such as Spot Remover "Fw", attack the plastic of the scale and lead to measurement inaccuracies after a few applications – for these products, either use the original cap or work with an acid-resistant measuring cup. The dip tube is designed for 270 millimeters for the standard 1-liter bottle and can be shortened to around 175 millimeters with scissors for 500 ml spray containers – after shortening, ensure that the cut edge is smooth and no splinters get into the concentrate. The cap does not fit Koch-Chemie's 5-liter, 10-liter, and 25-liter canisters. After use, rinse the dip tube and cap with warm water, let them dry completely before the next use – residual moisture can cause concentrate residues to clump over a long period of inactivity. Store dry and frost-free between 5 and 30 °C. The service life is more than 100 applications with proper use.