PLD-CPL-16 manicotto 16 mm x 16 mm portagomma PLD-050-16 manicotto 1/2" per 16 mm portagomma PLD-ELB-16 gomito 16 mm x 16 mm portagomma PLD-TEE-16 T 16 mm portagomma PLD-BV-16 valvola manuale 16 mm x 16 mm portagomma