Current products on the market can only seal or lock, but Permatex has created a product that does both.
eBay
2~20PCS 1/2"3/4"1"Inch POM Male/Female Thread Equal Path/Reducer/Bushing Joint Fish Tank Garden Irrigation Water Pipe Connectors
Aliexpress UK
eBay
1/2 3/4 Female Male Thread To 1/2 3/4 1 Inch Garden Hose Barb Connector 16mm 20mm 25mm Plastic Hose Fitting 2 Pcs
Aliexpress UK
Permatex High Temperature Thread Sealant lubricates threads for easy assembly and disassembly and locks and seals threaded fittings. Parts may be repositioned up to 4 hours after application. Temperature range from -65 degrees fahrenheit to 400 degrees fahrenheit.
eBay
1/4" 3/8" 1/2" 3/4" NPT BSPT Male To Female Thread Brass Reducer Bushing Reducing Pipe Fitting Coupler Connector Adapter 229PSI
Aliexpress UK
Permatex Pneumatic/Hydraulic 545 Thread Sealant, 36ml Bottle (54540) Meets OEM specifications Designed for locking and sealing high pressure hydraulic and pneumatic systems Contains no fillers or particles which can contaminate system fluids, foul valves or clog fine filters and screens Reliably cures on “as received” fasteners and controlled locking strength affords easy disassembly Resists all auto and shop fluid fittings and similar applications
eBay
Brass 3/4" Thread Garden Tap Hose Water Splitter 2-Way Garden Irrigation Valve Y Type Watering Adjustable Switch Controller
Aliexpress UK
Pneumatic Plumbing Brass Pipe Fitting Male/Female Thread 1/8" 1/4" 3/8" 1/2" 3/4" 1"BSP Copper Fittings Water Oil Gas Adapter
Aliexpress UK
Brass 1/2" To 3/4 3/8 Thread Connector Male 1/2 3/4 3/8 Female Hose Repair Copper Fittings For Tap Shower Faucet Adapter 1Pcs
Aliexpress UK
Brass Hose Fitting 6/8/10/12/14/16/19/25mm Barb Tail 1/8" 1/4" 3/8" 1/2" 3/4" 1" BSP Male Female Thread Copper Connector Coupler
Aliexpress UK
Faucet Adapter 22 Turn 16 18 20 22 24 26 28 30 32mm Internal and External Fine Tooth Faucet Conversion Thread Accessories
Aliexpress UK