Consumables Pack: Nozzles, Blocking Caps, and Spare O-rings
The pack contains 3 spray nozzles, 2 nozzle blocking caps, and 2 O-ring seals (1.79mm x 2.90mm) for the pneumatic gun valve. Compatible with TENKA TK-51, TK-31R, and TK-31N models.
Product details
The pack includes 3 spray nozzles, 2 nozzle blocking caps, and 2 O-ring seals (1.79 × 2.90 mm), designed for the pneumatic gun valve. The set is compatible with TENKA TK-51, TK-31R, and TK-31N models.
The blocking caps allow for quick modification of the gun's configuration, enabling the operator to choose how many nozzles remain active based on the type of work and the capacity of the compressor used.
The caps are installed quickly, without wrenches, tools, or threading operations. Once installed, each cap completely seals the corresponding nozzle path and prevents material discharge through that position. In this way, one or more nozzles can be temporarily disabled without modifying the gun.
This feature is particularly useful when adapting the airflow to the specific task. For plastering vertical walls, the gun can be used with one, two, or three active nozzles, depending on the surface area, work pace, and compressor performance.
In the case of ceiling plastering, using a single nozzle can facilitate gun control and reduce the effort required to hold it in position. For such tasks, it is also recommended to partially fill the mortar hopper so the assembly can be handled more easily.
The Role of Nozzle Count in Spraying Performance
The air supplied by the compressor must be distributed among all open nozzles. The more nozzles used simultaneously, the higher the total airflow the compressor must provide to maintain efficient spraying.
To project mortar at a distance of approximately 30 cm or more, it is recommended that each active nozzle receives at least 3 bar and an airflow of at least 80 l/min.
For this reason, with standard commercial compressors, it is recommended to use a maximum of 3 nozzles simultaneously if the available airflow does not allow for proper feeding of a larger number. The mere fact that a compressor can reach high pressure does not guarantee the same performance when air is distributed to multiple outlets.*
By blocking unnecessary nozzles, the available airflow can be directed to the remaining active positions, helping to achieve more consistent spraying and adapting the gun to the compressed air system's configuration.
Advantages
- quick configuration of the number of active nozzles;
- tool-free installation and removal;
- complete sealing of unused positions;
- ability to use the gun with one, two, or three nozzles;
- better adaptation to compressor airflow;
- easier handling depending on the type of work;
- efficient use of compressed air;
- compatibility with TENKA TK-51, TK-31R, and TK-31N models.
Choose the number of nozzles based on the job and the actual capacity of the compressor for the most efficient and controlled spraying.
* Actual pressure and airflow available at the nozzles may vary depending on compressor characteristics, hose diameter and length, pressure regulator, system losses, and gun configuration.
Questions, comments and opinions
Questions and experiences shared by customers and users.
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Share your question, experience or opinion.
Use classic mortar (multibat with sand or cement + sand + lime) with coarse sand .. 0.4-0.5 (from a gravel pit).
Tip: if you use welded mesh or steel of any kind, do not use lime in the mortar composition. make the plastering only with sand and cement. 6 shovels of sand + 1 of cement
So if you work at a relaxed pace in 2 people, we assure you that a compressor with a 50 liter tank, 8 bar pressure, and a minimum intake flow of 270 liters/minute is sufficient. The recommendation is for it to have 2 pistons rather than one.
You have here a video from one of our customers with a 50 liter / 8 bar compressor with a single piston.
Here is here also a compressor model with 2 pistons.
If you work in a team (one loads continuously, another levels with the straightedge, another carries bags, another mixes, etc.), the 50 liter compressor will drop the pressure to 5-6 bar and will not be able to keep it constant at 7-8 bar as it should.
In that case, a 100 liter compressor is necessary because its motor has the capacity to charge the tank faster at a constant pressure of 7-8 bar.
The nozzles of the plastering guns are calculated very precisely to fit within the parameters of these compressors. If I am not mistaken, the nozzle diameter is 2.35mm.
If you don't add enough cement, the mortar will bounce off the wall and won't set. You'll lose it on the floor.
If you add too much cement, the mortar becomes too sticky and hard to throw even with a hand trowel.
If you use classic plaster (sand + cement + lime), use the 6+1+1 ratio (6 shovels of sand, 1 shovel of lime, 1 shovel of cement) or a multiple (12+2+2). If you have rebar in the plaster for reinforcement, do not use lime in the mortar recipe because the iron will oxidize and you will have a rust stain that will always come to the surface of the wall.
TIPS:
- DO NOT leave the device in the water you washed it in because the cement water will penetrate the device and can harden.
- After washing the device, leave it in clean water during your work break.
- When unscrewing the nozzles to clean them, make sure the plastering machine is washed and clean.
- Also buy the pack of spare nozzles.
Soon we will update the models with a filter to stop all the dirt from the hose at the quick coupling of the plastering machine and to get rid of cleaning the nozzles. It is being worked on and will be released on the market as soon as possible. The filter will be placed at the entrance of the trigger's quick coupling and will retain any impurity in it, keeping the nozzles clean at all times.
I built a garage, and not being a professional, the walls weren't exactly straight, so I had to apply quite a thick layer when plastering. This is how it looks at the end: PHOTO
Approximately 400 sqm per day are applied by one person. I want to mention that on the first day we used very fine sand and it went very poorly. I thought the plastering machine was at fault. Then we switched to coarse-grained sand (0.4m) and it works superbly. I'll make a video.
So, for a compressor to work without issues in a hobby setting (meaning if you are plastering your own house at a relaxed pace), you need a minimum intake flow rate of 250 l/min, a pressure of 8-9 bar (never exceed 9 bar), and an air tank of at least 50 liters.
Ideally, it should have 2 pistons instead of just one. For 2-piston engines, the flow rate is double (400l/min) and the engine manages to fill the tank much faster and sometimes take a break.
If you work in a professional setting, meaning with a team (one at the concrete mixer, another loading, another using the straight edge), you need a compressor with a 100-liter tank, the rest of the parameters remain the same (flow rate, pressure, etc.).
If you already have a smaller compressor and do not wish to invest in a more powerful one, you can use the Tenka machine with only 2 nozzles. You block the rest of the nozzles; some blocking caps are included in the package. With 2 nozzles, the machine loads up to 2 cm of plaster thickness in a single second if you hold it in position. So it is quite fast even with 2 nozzles. The excess pressure will be released from under the gun trigger.
The ones with 3 nozzles will be discontinued soon.
Tip: buy at least 15 - 20 meters of hose to keep the compressor at a distance. The noise of the compressor causes irritation and stress after a day on the construction site.
The maximum recommended length of the hose is 50m. If you exceed this length, a half-second delay will occur from the moment you pull the gun trigger because the hose will equalize its internal pressure with that of the compressor tank. And the volume of the hose is already large at a length of over 50m, which causes the delay to appear. The hose must be fitted at one end with a male quick coupler (approx. 4 lei) and at the other end with a female coupler (12 lei). Or you can find it already fitted in Dedeman (approx. 50 lei) So:
- Inner diameter 8mm
- Hose length minimum 15m.
- At one end a male quick coupler and at the other end a female coupler example : here
The most commonly used and cost-effective mortar: link mortar
Cheap compressor (hobby) but tested by us on the 3-nozzle model: link compressor
Use sand with a grain size as large as possible: 0.3 - 0.4 mm
Other mortar recipes can be found in the instructions in the package. Good luck with your work and God bless.