We can customize our vent caps for special applications. Below are examples of a few of the customizations we have done.

In our smaller vent caps under 3 inches, the screen meshes we use are 24 mesh or finer to exclude insects such as mosquitoes.  The mesh is plastic so it it non-corroding, however there are different choice of material available.   Conventionally we use polypropylene for its physical rigidity but Nylon and Polyester are also viable alternatives. Here is a chemical resistance chart comparing the three materials side-by-side.

Large Tank Vent Cap - Plastic

VENT CAP WITH FINE SCREEN.  Due to a local ordinance this customer wanted an 8 inch vent cap with 31 mesh screen (600 micron) instead of the perforated PVC sheet. 




flange vent cap

LOW PROFILE VENT CAP WITH FLANGE MOUNT for large tanks. Screen is perforated PVC with 1/8″ holes – 40% open area. This unit is a low profile with oeveral height only 6 inches.

tall custom vent cap

TALL VENT CAP made to our customer’s specifications. The intent was to prevent sloshing in vehicles.

mushroom style vent cap


VENT CAP with a built-in check valve to control air flow in one direction.

custom vent cap

VENT CAP with a custom machined flange on our CNC machine. (Braylock mounting-hole pattern).