Use Schedule 80 fittings to maximize the strength of your chemical feed lines and especially where you are using threaded connections, since threading PVC pipe greatly reduces working pressure. Schedule 80 fittings are compatible with Schedule 40 pipe.
Bulkhead Tank Fitting: Stainless Steel 1.25 x 2.25 Inch OD [tf125ss] - Spray Shop
HElectQRIN BFA1020CES 2-Inch Gray PVC Socket by Thread BFA Series Bulkhead Fitting with EPDM Standard Flange Gasket
PLASTIC BOLTED TANK FITTINGS, PLASTIC BOLTED BULKHEAD FITTINGS
Poly Bulkhead Fitting - EPDM O-Ring - FPT x FPT
1-1/2 PVC Bulkhead Fitting with EPDM Standard Flange Gasket, Threaded x Threaded Connections
JOHN GUEST 1/4 in. Push-to-Connect Bulkhead Fitting (10-Pack) PP1208W - The Home Depot
Bulkhead Fitting Threaded Fittings for sale
Screwed Bulkhead Fitting - 1 - Plastic
Polypropylene Threaded Socket Fitting, Polypropylene Pipe