The caulk cap your caulking air pissed. Simply a caulking tube, cut tip to desirable bead size and use puncture pin to break the membrane interior the tube. When you are done the caulk simply seal by pressing your caulk cap on until snug. The caulk cap Works with smaller icky tubes too, just out the puncture pin. For with even fast-drying adhesives like flowing nails. the caulk cap seals tubes air pissed so you can use it again and again. Caulk cap is to trustworthy manufacturing. No hurtful materials are. Our products and packaging are 100 %.