S15 -1 A single arm spider fitting   S20 -1 A single arm spider fitting   S15 -1V A single arm spider fitting   S20 -1V A single arm spider fitting   S15 -2 A two arm spider fitting   S20 -2 A two arm spider fitting   S15 -2V A two arm 'V' shaped spider fitting   S20 -2V A two arm 'V' shaped spider fitting   S15 -4 A four arm spider fitting   S20 -4 A four arm spider fitting Fixed Spiders   S15 -1S A single arm side-mounted spider fitting   S20 -1S A single arm side-mounted spider fitting   S15 -2S A two arm side-mounted spider fitting (two S15-1S mounted back to back)   S20 -2S A two arm side-mounted spider fitting (Two S20-1S mounted back to back)   S15 -2VS A two arm 'V' shaped side-mounted spider fitting   S20 -2VS A two arm 'V' shaped side-mounted spider fitting   S15 -4S A four arm side-mounted spider fitting (two S15-2VS mounted back to back)   S20 -4S A four arm side-mounted spider fitting (two S20-2VS mounted back to back)