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FAQs

Dosage scales with tyre size. The OKO product page provides a dosage chart by tyre dimension for each product grade. As a rough guide: agricultural tractor rear tyres (typically 16.9R30 to 18.4R38) use 1.5–4 litres per tyre depending on size; tractor front tyres use 0.5–1.5 litres; plant excavator and telehandler tyres use 2–6 litres per tyre depending on size; HGV tyres use 1–2 litres each. Always consult the dosage chart for the specific tyre dimension; under-dosing reduces sealing effectiveness, over-dosing wastes product and adds unnecessary weight.

Off Road — the agricultural-tractor and field-equipment grade. Suitable for tractors, agricultural implements, and lighter off-road applications. Heavy Duty — extends to plant equipment, construction machinery, telehandlers, and heavier off-road applications. HGV — commercial trucks, PSV applications, and on-road heavy-vehicle use. Mining — the heaviest off-highway grade for mining-pattern tyres and the most demanding applications. Each grade is formulated for the operational hazards typical of that application — match the grade to your equipment class.

Yes — OKO sealant works in both tubeless and tubed tyres. Most modern agricultural and plant tyres are tubeless, where the sealant is introduced directly into the tyre cavity through the valve stem. For tubed tyres (some smaller agricultural implements, older plant equipment, motorcycles, and ATVs), the sealant is introduced into the inner tube. The OKO Bike/ATV grade is specifically formulated for tubed-tyre applications. Mixing different sealant brands or types is not recommended — if a tyre already contains a different sealant, drain and clean the tyre before introducing OKO.

Yes — bulk 25-litre drums and pallet quantities are available across the OKO range, with significant trade pricing on volume orders. For agricultural contractors, plant fleet operators, HGV operations, and on-site construction-equipment fleets, contract-supply arrangements with scheduled delivery are available. WhatsApp 07754288583 with the typical fleet size (number of tyres treated per year) and the application class for a fleet quotation. Application accessories — injection tools, valve-core removers, and dispensing equipment — are supplied separately under the Accessory sub-category.

Returns are accepted within 30 days of purchase, in original packaging, on orders delivered within the United Kingdom. For damaged-on-arrival items, report within 24 hours with photographs to [email protected] — we will typically arrange collection and replacement at no cost to you. For parts that don't fit your machine, the Fit Guarantee covers a hassle-free return at no cost. For buyer's remorse — you've changed your mind or ordered the wrong item, email us first to obtain a Return Merchandise Number; a restocking fee may apply. Refunds are issued to the original payment method once the return is inspected.

Delivery time depends on the product, your destination, and availability — the estimated time for any item appears on the product page, and 'Check where we deliver' confirms coverage for your postcode before you order. Next-day delivery is available on most products; the option appears at checkout when applicable. We deliver across the UK, Europe, the Middle East, and Africa. Use the country selector at checkout to confirm coverage and delivery options for your destination.

Tyre Sealant

Tyre Sealant is a dedicated sub-category covering the puncture-prevention and tyre-care fluids supplied at Parts For Machines. Within Plant & Agriculture, this is a high-volume category — the sealants are used by agricultural contractors, plant-fleet operators, HGV operations, and off-road vehicle owners to prevent the operational disruption that punctures cause in field, site, and on-road work. Within Tyre Sealant you will find Off Road, Heavy Duty, and HGV (the largest sub-category — the heavy-duty and HGV-grade sealants for plant equipment, agricultural tractors, commercial trucks, and heavier off-road applications), Bike, ATV, and Quad (sealant for motorcycle, all-terrain vehicle, and quad-bike applications), Car and Van (automotive and light-commercial-grade sealant), and Accessory (the application accessories — sealant injectors, valve-core tools, and fitting equipment). Parts For Machines is an Authorised Distributor and Seller of OKO across the tyre-sealant range. OKO is the leading UK trade-channel brand for tyre sealants, with the Off Road, Heavy Duty, HGV, Mining, Bike/ATV, and Car/Van product lines covering the full spectrum of vehicle and machinery applications. The Off Road product is the agricultural-tractor and field-equipment standard; Heavy Duty extends to plant equipment and construction-site machinery; HGV covers commercial trucks and PSV applications; Mining extends further into the heaviest off-highway work. Tyre sealant works by coating the inside of the tyre with a fluid layer that, when punctured, gets carried by air pressure into the puncture hole where it dries and forms a permanent plug. The sealant prevents slow leaks and complete deflations from operational hazards — thorns, nails, sharp stones, fence wire, and the sharp debris of working sites and fields. It does not repair structural tyre damage and is not a substitute for tyre replacement when the carcass is damaged. Dosage is determined by tyre size — agricultural tractors typically use 1.5–4 litres per tyre depending on size; plant equipment uses larger volumes; HGV applications similarly scale with tyre dimension. The OKO product page provides dosage charts by tyre size for each application class. Trade and bulk pricing applies on volume — WhatsApp 07754288583 for fleet and contractor quotations.

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