The BE Pressure 85.790.002 is a Viton O-ring for the inlet valve on BE pressure washer pumps. It is a small part with an outsized job: sealing the water inlet against leaks while standing up to the heat and chemicals that destroy ordinary rubber rings.
Why Viton matters
Viton is a fluoroelastomer rated for service well above what standard Buna-N rubber tolerates - roughly 400 degrees F - with strong resistance to petroleum products, acids, oxidizing agents, and the sodium hypochlorite solutions used in soft washing. On machines that run hot water or draw cleaning chemicals, a Viton seal keeps its shape and elasticity where a standard ring swells, hardens, and cracks. Its low compression set means it springs back instead of flattening permanently under clamp pressure.
Use cases
Replace this ring when the inlet connection drips, sprays, or will not hold prime, when servicing the inlet valve during seasonal maintenance, or any time the existing ring shows nicks, flat spots, or brittleness. Pressure-washing crews that run downstream chemicals or hot-water rigs keep spares in the truck, because the thirty-second swap is the cheapest repair on the machine.
Specifications
- BE Pressure genuine part 85.790.002
- Material: Viton fluoroelastomer
- Application: inlet valve seal on BE pressure washer pumps
- Temperature resistance: up to approximately 400 degrees F
- Resists petroleum products, acids, oxidizers, and sodium hypochlorite
Replacement tips
Before seating the new ring, wipe the inlet valve groove clean and inspect it for nicks or mineral scale - a damaged groove will cut a new ring quickly. A light film of silicone grease (never petroleum jelly on standard rings, though Viton tolerates petroleum) helps the ring seat without pinching and makes the next removal easier. Hand-tighten the connection first and bring it to snug; overtightening squeezes the ring past its designed compression and shortens its life. If a new ring leaks immediately, check for a scored sealing face rather than re-tightening harder.
O-rings are the classic stitch-in-time part: a one-minute inspection at spring start-up, when winter storage has dried and hardened seals, catches most failures before they strand a machine on a job. Add this ring to your seasonal kit alongside pump oil and quick-connect O-rings and the inlet end of the machine effectively never goes down.
Because Viton rings look identical to ordinary black Buna rings once installed, label your spares bag - putting a standard ring into a hot-water inlet by mistake gives you a seal that fails again in weeks instead of seasons, and the two-minute labeling habit prevents the repeat repair and the second service stop.
Frequently asked questions
Why Viton instead of a standard rubber O-ring?
Viton is a fluoroelastomer that resists petroleum products, acids, oxidizers, and the sodium hypochlorite used in soft washing - chemicals that swell and crack ordinary Buna rubber. It also handles heat up to roughly 400 degrees F, so it survives hot-water machines.
How do I know my inlet valve O-ring needs replacing?
Drips or spray at the inlet connection, a machine that loses prime, or a flattened, nicked, or brittle ring on inspection all point to a worn O-ring. It is the cheapest fix for an inlet leak.
Which machines does this fit?
Part 85.790.002 is BE's Viton inlet-valve O-ring for BE pressure washer pumps. Check your pump's parts diagram for this part number before ordering.
Should I keep spares on hand?
Yes. O-rings are wear items - crews that run chemicals or hot water typically keep a few in the truck so a thirty-second swap never stalls a job.
Discount Cleaning Products is an authorized dealer with US-based customer service. Our team works with janitorial contractors, facility managers, and property-maintenance professionals every day and can help you confirm fit and compatibility before you order.
