Seal Kit - RS Knapsack Sprayers

Repair kit for our RS12 & RS18 knapsack sprayers, which includes the most commonly replaced parts so having them with you will ensure that, should a seal or flange require replacement, you won't be wasting time as you will have the parts you need.

The kit includes a piston ring and two clear seals/washers together with an O-ring and compression valve which are both made from FPM rubber.

The piston ring is one of the heaviest used parts in a sprayer as it runs up and down, within the compression shaft, as the compression handle is pumped to increase spraying pressure. This ring must maintain contact with the inside of the compression shaft otherwise pressure can't be increased. As it moves it creates friction and heat which, over time, can cause the ring to wear.

• Brand - Mesto sprayers
• Material - FPM rubber
• Piston Ring - included
• Style - backpack/knapsack sprayers
• Compression valve - included

What is a compression valve (valve disc)?

If you open your sprayer you will see the long compression shaft, which is attached to the head of the sprayer. At the base of this shaft you will see the round, plastic valve disc. This acts as a one-way valve so that when you pump the handle it either blocks the shaft, stopping liquid from entering it, or opens to allow air to pass from the shaft into the tank.